Friday

April 29, 2016
Number of results: 30,068

**Trigonometry/Geometry - Law of sines and cosines**

In most geometry courses, we learn that there's no such thing as "SSA Congruence". That is, if we have triangles ABC and DEF such that AB = DE, BC = EF, and angle A = angle D, then we cannot deduce that ABC and DEF are congruent. However, there are a few special cases in which...
*November 21, 2013 by Sam*

**geometry**

Find the measure of the vertex angle of an isosceles triangle if either of the exterior angles formed by extending the base measures of 112
*December 1, 2011 by tina*

**math**

The longer base of an isosceles trapezium is 20 cm, its legs are 10cm. The legs of the trapezium are extended by 8 cm long to gain an isosceles triangle.Find the shorter base of the trapezium. Please help me:)
*January 31, 2013 by Brigitta*

**Algebra 2 review**

In triangle ABC, the ratio of the measure of angle A to the measure of angle B is 3:5. The measure of angle C is 20 more than the sum of the measure of angles A and B. What is the measure of each angle in triangle ABC?
*April 28, 2011 by Beth*

**geometry**

In right triangle ABC, measure of angle ACB= 90 and segment CD is the altitude to the hypotneuse AB. Ad= 6 cm and BD= 4 cm. Find the length of segment CD to the nearest hundredth.
*May 23, 2012 by Colleen*

**trig**

the length of the base of an isosceles triangle is 30.42 inches. each base is 26.54 degrees. find the length of the two equal sides of the triangle to the nearest hundredths. i get 15.19. is that right?
*September 6, 2011 by ALISON*

**Algebra II**

The area of a triangle varies jointly as its base and altitude. By what percent will the area change if the base is increased by 15% and the altitude decreased by 25%?
*November 21, 2011 by Ashley*

**Math**

The area of a triangle varies jointly as its base and altitude. By what percent will the area change if the base is increased by 15% and the altitude decreased by 25%?
*November 22, 2011 by Zoey*

**Algebra II**

The area of a triangle varies jointly as its base and altitude. By what percent will the area change if the base is increased by 15% and the altitude decreased by 25%?
*November 22, 2011 by Jake*

**Algebra II**

The area of a triangle varies jointly as its base and altitude. By what percent will the area change if the base is increased by 15% and the altitude decreased by 25%?
*November 22, 2011 by Jake*

**Math**

The area of a triangle varies jointly as its base and altitude. By what percent will the area change if the base is increased by 15% and the altitude decreased by 25%?
*November 22, 2011 by Jake*

**math**

The vertices of a triangle are listed below. H(-2,4), I(22,4), J(10,-1) Which of the following correctly classifies the triangle? 1.The triangle is an obtuse isosceles triangle. 2.The triangle is a right scalene triangle. 3.The triangle is an obtuse scalene triangle. 4.The ...
*May 4, 2012 by ana*

**honors/Geometry**

how do you write out proofs? To be more specific with my question, how do you find the alternate exterior angles theorem? Be sure the result is not a postulate. If it is then there's nothing to prove, it's given. If it is a theorem -a provable statement- then review the ...
*September 27, 2006 by chelsea*

**geometry**

find x, if ABC is an isosceles triangle with AB=BC
*April 15, 2011 by Step*

**maths-urgently needed**

In right angled triangle ABC angle B=90 degree and AB= root 34 unit. The coordinates of point B and Care (4,2)and (-1,y) respectively. If area of triangle ABC = 17 sq.units, then find value of y.
*February 12, 2013 by Anonymous*

**Geometry....**

the triangle is named ACB and E is the intersection of AT which bisects CB, BR which bisects AC and CS which bisects AB. CS, RB, and AT are all medians. ES, RE and ET equal 3x. I can't figure this out at all. Please explain. Thanks
*May 18, 2009 by Anonymous*

**trigonometry 28**

In triangle ABC , if angle c=90,then prove that sin^2 A+sin^2 B=1.
*July 2, 2015 by pankaj khanna*

**geometry**

given: line DF congruent line EF; line DF perpendicular line AB; line EF perpendicular BC. prove line BF bisects angle ABC
*September 27, 2011 by Anonymous*

**Math (Proportions)**

3. The ratio of the altitude of a triangle to the length of its base is 5:12. Calculate the altitude if the length of the base is 42mm. 17.5 length/base= 5/12=x/42= 17.5
*October 18, 2013 by Jerald*

**maths**

if bisector of any angle of triangle bisects he opposite side then it is isoceles triangle
*November 2, 2010 by abhiskar*

**college algebra**

if the altitude and the base of a triangle are each increased by 4 inches the area of the triangle will be increased by 42 square inches. if the altitude is increased by 3 inches and the base is decreased by 2 inches the area will be increased by 5 square inches. find the base...
*July 12, 2013 by quintana*

**Geometry**

In quadrilateral exam EA intersects XM at G and XM bisects angle EXA and angle EMA Prove EG is congruent to GA Can you please help me
*December 23, 2014 by Kiki*

**pre calculus**

The base of an Isosceles triangle is half as long as the two equal sides. Write the area of the triangle as a function of the length of the base. the answer is: A=a^2times the square root of 15 ------------------------------ 4 How did they get this answer? Thanks!
*September 1, 2008 by Acorn*

**Math**

Use the figure to answer the following questions. figure for questions 13 1. Name a pair of complementary angles. (1 point) angle sign1 and angle sign4 angle sign1 and angle sign2 angle sign3 and angle sign4 angle sign1 and angle sign6 2. If mangle sign1 = 37, what is the ...
*March 8, 2015 by Joe*

**Math**

Use the figure to answer the following questions. figure for questions 13 1. Name a pair of complementary angles. (1 point) angle sign1 and angle sign4 angle sign1 and angle sign2 angle sign3 and angle sign4 angle sign1 and angle sign6 2. If mangle sign1 = 37, what is the ...
*March 10, 2015 by CONNEXUS ACADEMY*

**Trigonometry**

ABC is a right triangle with AB = 2, BC = 3\sqrt{5}, AC = 7 and \angle ABC = 90^\circ. If \cos \angle BAC = \frac{a}{b}, where a and b are coprime positive integers, what is the value of a + b?
*March 27, 2013 by Dan*

**Trigonometry**

Triangle ABC is a right triangle with right angle at C. CD is perpendicular to AB. BC=4 and CD=1. find the area of the triangle ABC.
*September 8, 2012 by Roy*

**Math**

Answer with Always, Sometimes or Never True. Kindly explain why so that I can understand. Thanks. 1. An interior angle and an exterior angle of a triangle are supplementary. 2. The bisector of an angle of an isosceles triangle is also a perpendicular bisector. 3. The sum of ...
*January 22, 2015 by Millie*

**pre-algebra **

Use the figure to answer the following questions. figure for questions 13 1. Name a pair of complementary angles. (1 point) angle sign1 and angle sign4 angle sign1 and angle sign2 angle sign3 and angle sign4 angle sign1 and angle sign6 2. If mangle sign1 = 37, what is the ...
*February 26, 2016 by cupcakesss *

**angles**

one angle of an isosceles triangle is 40 degrees. what are the two possible sizes for the larger angle(s) in this triangle?
*May 31, 2011 by montana*

**geometry**

Isosceles triangle ABC has vertices at A(0, 0), B(8, 0), and C(x, 12). The value of x could be
*January 12, 2012 by Anonymous*

**Geometry**

Isosceles triangle ABC has vertices at A(0, 0), B(8, 0), and C(x, 12). The value of x could be
*March 8, 2012 by Anonymous*

**precalc**

Is triangle ABC scalene, isosceles, or equilateral if A = (4, 6) B = (-4, 2) and C = (0, 2)? Why?
*December 3, 2015 by Patricia*

**MATH**

Use the figure to answer the following questions. figure for questions 13 1. Name a pair of complementary angles. (1 point) angle sign1 and angle sign4 angle sign1 and angle sign2 angle sign3 and angle sign4 angle sign1 and angle sign6 2. If mangle sign1 = 37, what is the ...
*February 15, 2013 by Anonymous*

**Math- Geometry Proofs**

What are some ways to prove that a triange is isoscles? i have to make a two column proof based on a problem. What is the exact problem I need help with my geometry homework. We are doing proofs and i need some help because proofs are really hard!! def. isosceles -or- if two ...
*November 21, 2006 by Jenny*

**Math**

the altitude, AD, to the hypotenuse BC of right triangle ABC divides the hypotenuse into segments that are 8 and 10 cm long. find the length of the altitude.
*October 19, 2013 by anae*

**geometry**

In an isosceles triangle, if a base angle has a measure of 43 degrees, then the vertex angle must have a measure of 80 degrees as well.
*November 1, 2011 by Anonymous*

**Geometry**

In right triangle ABC, the median to the hypotenuse has length 15 units and the altitude to the hypotenuse has length 12 units. What is the legth of the shorter leg of triangle ABC?
*January 6, 2011 by Jake*

**math**

The base of an isosceles triangle is four less than the sum of the lengths of the legs. If the perimeter of the triangle is 44, find the length of the three sides of the triangle.[ Only an algebraic solution will be accepted ]
*July 27, 2013 by vincent*

**Math**

Two isosceles triangles have perimeters of 8 and 15 centimeters, respectively. They have the same base length, but the legs (the non base sides) of the larger triangle are twice as long as the legs of the smaller triangle. For each triangle, what is the length of a leg?
*January 1, 2013 by Bay*

**maths**

Choose three options which are true: a) an angle of 150 degrees is equivalent to 2pie/3 radians. b) Cos 0 = cos (0 pie/2) for al values of 0. c) Sin 0 = cos (0 pie/2) for all values of 0. d) If triangle ABC has a right angle at B, then sin A = cos C e) In any triangle ABC...
*May 20, 2007 by sarah*

**Geometry: Ms. Sue or Steve or someone help please?**

Given a triangle ABC with A(6b,6c) B(0,0) and C (6a,0), prove that the medians of the triangle are concurrent at a point that is two thirds of the way from any vertex to the midpoint of the opposite side. I'm not sure how to prove this. I tried and when I got to finding the ...
*October 24, 2013 by Cecilia*

**trigo**

In a right tringle ,angle ABC has a value of 37 degree while its opposite side is equal to 5,where angle c=90 degree Find A.)Remaining sides of the triangle B.)Angle ABC using any trigonometry Functions
*July 12, 2011 by William john*

**MATHS**

In triangle ABC, BC is produced to D. If angle ACD = 110 degree and angle ABC = 70 degree. Find angle BAC. Give reason.
*March 12, 2012 by Job*

**geometry**

I can't figure out this problem, help would be much appreciated! Suppose line BC bisects angle ABE, and D is the interior of angle ABC. If m-angle CBD=28 degrees, and m-angle ABE=136 degrees, find m-ABD.
*April 26, 2012 by bleach*

**Geometry**

In $\triangle ABC$, we have $AB = AC = 13$ and $BC = 10$. Let $M$ be the midpoint of $\overline{AB}$ and $N$ be on $\overline{BC}$ such that $\overline{AN}$ is an altitude of $\triangle ABC$. If $\overline{AN}$ and $\overline{CM}$ intersect at $X$, then what is $AX$?
*April 19, 2016 by Gill*

**Math**

Prove that if the sides of one angle are parallel to the sides of another angle, the angles are congruent. Given: BA||ED, BC||EF, AND BEG Prove:angle ABC is congruent to angle DEF
*March 3, 2015 by Serenity *

**math**

4. Name a pair of corresponding angles. (1 point) 1 and 6 2 and 6 3 and 5 4 and 5 5. if m <4 = 105 then what is the m<8 105 75 175 25 6. ACB is congruent to which angle? (1 point) ZYX XYZ XZY YXZ 7.Side CA is congruent to which side? (1 point) ZX YX XY YZ 8.Translate ...
*January 11, 2016 by help me asap*

**Precalculus**

The sides of an isosceles triangle are 10 cm, 10 cm, and 12 cm. A rectangle is inscribed in the triangle with one side on the triangle's base. The other two vertices of the rectangle are on the triangle's legs. Find the Maximum Area of the Rectangle.
*November 18, 2012 by Georges*

**Geometry**

Triangle $ABC$ is isosceles with point $A$ at the point $(2, 7)$, with point $B$ at $(-2, 0)$ and with point $C$ at $(3, -1).$ Triangle $ABC$ is reflected over $\overline{BC}$ to form $\triangle A'BC$. Triangle $A'BC$ is reflected over $\overline{A'C}$ to form $\triangle A'B'...
*February 29, 2016 by Praphul*

**Geometry**

Write an indirect proof that an obtuse triangle does not have a right angle. Given: Triangle RST is an obtuse triangle. Prove: Triangle RST does not have a right angle. Let angle S be an obtuse angle. Assume Triangle RST has a right angle. Let angle R be a right angle. Use ...
*November 18, 2010 by chica*

**Math**

Triangle ABC is an isosceles triangle If the measure of B is 37 degrees what is the measure of C? A.37 B.53 C.106 D.143 I think it's A or C?
*February 26, 2013 by Lance*

**algebra**

Find the number of degrees in the measure of one of the base angles of an isosceles triangle, if the measure of the vertex angle is 36 degrees less than the sum of the measures of the base angles.
*January 14, 2011 by mw*

**geometry**

Find the number of degrees in the measure of one of the base angles of an isosceles triangle, if the measure of the vertex angle is 36 degrees less than the sum of the measures of the base angles.
*January 14, 2011 by lorie*

**geometry**

find the length of ab & bc of a triangle abc having given the length of ac = 28inch, angle abc = 90, angle bac =30,, angle acb = 60
*January 4, 2012 by Anonymous*

**geometry**

8. iN triangle ABC, a point D is on AC so that AB=AD. ANGLE ABC - ANGLE ACB = 30. IND ANGLE CBD. PLEASE TELL ME WHAT TO DO. I BEG YOU. PLEASE
*October 22, 2013 by nicole*

**math**

the measures of the interior angles of a triangle are x,y and 2x respectively. if the triangle is isosceles, what is one possible measure of an angle of this triangle, in degrees?
*July 24, 2013 by anonymous*

**MATH**

the measures of the interior angles of a triangle are x,y and 2x respectively. if the triangle is isosceles, what is one possible measure of an angle of this triangle, in degrees?
*July 24, 2013 by Help!!*

**Math**

Triangle ABC is similar to triangle APQ, with angle CBA equal to angle QPA and angle A common to both triangles. The lengths of sides AB, AP and PQ are 90 cm, 60 cm and 30 cm. Calculate the length of side BC.
*June 4, 2010 by Golkhadi nep*

**geometry**

the transamerica pyramid building shown in the photograph has four faces shaped like isosceles triangles. The measure of a base angle of one of these triangles is about 85. What is the approximate measure of the vertex angle of the triangle?
*January 17, 2012 by alex*

**geometry**

There is no need to ask the same question over and over. How do I find the vertex angle of an isosceles triangle with base angles of (4x-9) and (3x+2).
*August 16, 2007 by bobpursley*

**Math**

Ray AF bisects angle DAB, Ray AE bisects angle DAF, and ray AD bisects angle CAF. Draw a picture that represents this situation. (I drew a picture but I still do not understand.) If the measure of angle DAB=x, find the measure of angle BAC. Answer choices: 3x over 4 , 6x, or ...
*November 7, 2008 by Emma*

**Math**

Again i wrote the question wrong. 4. Classify the triangle with angles measuring 69, 42, and 69. A. right B. equilateral C. isosceles acute D. isosceles obtuse You said isosceles but i didn't know whether it was C or D. Here's one more. 3. Classify the triangle with side ...
*January 22, 2013 by Jman*

**Geometry**

Find the measure of each side of isosceles triangle ABC with AB = BC if AB = 4y , BC = 3y + 2 , and AC = 3y.
*October 19, 2010 by Rhonda*

**Geometry **

In the diagram below, the length of the legs AC and BC of right triangle ABC are 6 cm and 8 cm, respectively. Altitude CD is drawn to the hypotenuse of △ABC. What is the length of AD to the nearest tenth of a centimeter?
*June 18, 2012 by Alma*

**math (please help)!**

Geometry ***(PLEASE CHECK MY ANSWER)*** 1. If triangle RST = triangle NPQ, which of the following is true? A.) R = P B.) R = Q C.) T = P D.) T = Q <----- My Answer! 2. Given triangle RST = triangle NPQ, RT = 7x - 5, NQ = 5x + 11, find the length of RT and NQ...
*November 15, 2013 by Shadyy*

**math**

in an equilateral triangle ABC,O is any point in the interior of the triangle.From O perpendiculars are drawn to the sides.prove that sum of these perpendiculars is constant for any triangle
*December 2, 2012 by Anonymous*

**math**

Triangle ABC , BC = CD and (angle ABC - angle bac ) =30, the measure of angle and is?
*February 25, 2016 by vivek*

**Math**

The altitude of a triangle is 2cm longer than its base. The area of the triangle is 60 cm*2. What are the dimensions of the triangle?
*May 26, 2014 by Lorrie*

**math**

Write a sequence of transformations that maps triangle ABC onto triangle A''B''C''. -------------------------------------- A in ABC is 1,9, B in ABC is 3,12, and C in ABC is 4,4. A'' in A''B''C'' is 3,-3, B'' in A''B''C'' is 5,-6, and C'' in A''B''C'' is 6,2.
*January 23, 2013 by kayla*

**Math**

1. The base of an isosceles triangle is 14 cm in length and the angle opposite the base measures 86 degrees. Find the length of each of the congruent sides. 2. A ski slope has a 42 degrees incline and 170 yard long. Find the vertical drop.
*February 4, 2014 by Tsunayoshi*

**sanket study centre**

In triangle ABC p,q,r such that they lie interior of triang ABC and AP=AR and all the three sides of triangle PQR are scalan if area of triangle PQR is 100 then find area of triangle ABC
*November 11, 2015 by sanjay*

**GEOMETRY**

The sides of a triangle are 8,15 and 18 the shortest side of a similar triangle is 10 how long are the other sides? Find the scale factor of similar triangles whose sides are 4,12,20 and 5,15,25 Assume that traingle xyz is similar to triangle rpn with x(ray sign) r and p(ray ...
*November 16, 2013 by BARBIE LEE*

**geometry**

The sides of a triangle are 8,15 and 18 the shortest side of a similar triangle is 10 how long are the other sides? Find the scale factor of similar triangles whose sides are 4,12,20 and 5,15,25 Assume that traingle xyz is similar to triangle rpn with x(ray sign) r and p(ray ...
*November 17, 2013 by barbie lee*

**math**

the length of the base of a triangle is 4 times its altitude. if the area of a triangles is 162cm2 find the altitude
*February 11, 2011 by annette*

**geometry easy**

The sides of a triangle are 8,15 and 18 the shortest side of a similar triangle is 10 how long are the other sides? Find the scale factor of similar triangles whose sides are 4,12,20 and 5,15,25 Assume that traingle xyz is similar to triangle rpn with x(ray sign) r and p(ray ...
*November 17, 2013 by barbie lee*

**algebra**

ABC and DCB are right angles .That A and D respectively.And AC=DB. Prove that angle ABC is equal to angle DCB?
*August 15, 2012 by TUHITUHI*

**isosceles triangle**

An isosceles triangle is a triangle that has two equal sides. Find AB, BC and AC. Determine if the triangle is isoseles or not based on the lengths of the three sides. can someone show me how to solve?please The triangle is isosceles if AB = BC, or BC = AC, or AB = AC. Without...
*July 26, 2007 by Jim*

**maths**

Choose three options which are true: a) an angle of 150 degrees is equivalent to 2pie/3 radians. b) Cos 0 = cos (0 pie/2) for al values of 0. c) Sin 0 = cos (0 pie/2) for all values of 0. d) If triangle ABC has a right angle at B, then sin A = cos C e) In any triangle ABC...
*June 8, 2007 by kat*

**math**

the+base+jk+of+an+isosceles+triangle+hjk+is+produced+to+l+if+j+%3D69+degree+calculate+hkl&es_nrs=true&pf=p&sclient=psy-ab&oq=the+base+jk+of+an+isosceles+triangle+hjk+is+produced+to+l+if+j+%3D69+degree+calculate+hkl
*March 13, 2013 by Anonymous*

**MATH trigonometry **

in an isosceles triangle the vertex angle measures 90 degrees and the length of each congruent leg is 5√2. whats the length of the base?
*February 10, 2010 by sara*

**Math**

The legs of an isosceles triangle measures 2x^4+2x-1 units. The perimeter of the triangle is 5x^4-2x^3+x-3 units. Write a polynomial that represents the measure of the base of the triangle.
*March 12, 2013 by Ally*

**Math**

The legs of an isosceles triangle measures 2x^4+2x-1 units. The perimeter of the triangle is 5x^4-2x^3+x-3 units. Write a polynomial that represents the measure of the base of the triangle.
*March 12, 2013 by Ally*

**Algebra**

The legs of an isosceles triangle are 0.3 foot less than twice the base. The perimeter of the triangle is 4.9 feet. What is the length of one of the triangles legs?
*May 1, 2015 by William*

**geometry**

An obtuse isosceles triangle has one angle with a measure of (2x) degrees and another angle (5x) degress. What is the measure of the third angle of the triangle?
*March 31, 2015 by Jen*

**Math**

If the base of an isosceles triangle is decreased by 40% and its height is increased by 10%, then what is the percent change in the area of the triangle?
*January 8, 2008 by Sandi*

**GEOMETRY**

Which statement is the contrapositive of the following conditional: If a triangle is isosceles, then it has 2 congruent sides. a. If a triangle does not have 2 congruent sides, then it is not isosceles. b. If a triangle is isosceles, then it does not have 2 congruent sides. c...
*February 21, 2012 by LAUREN*

**Pre-cal**

Each of the two congruent sides of an isosceles triangle are 10 centimeters more than 1/2 the length of the base. If the perimeter of the triangle is to be at most 100 centimeters, what is the maximum length of the base?
*January 21, 2016 by Monica*

**math**

The base of an isosceles triangle is 4/3 cm.the perimeter of the triangle is 4 2/15cm. What is the length of either of the remaining equal sides
*December 16, 2011 by Gousia*

**math**

The base of an isosceles triangle is 4/3 cm.the perimeter of the triangle is 4 2/15cm. What is the length of either of the remaining equal sides
*December 16, 2011 by Gousia*

**geometry triangles**

The sides of a triangle are 8,15 and 18 the shortest side of a similar triangle is 10 how long are the other sides? Find the scale factor of similar triangles whose sides are 4,12,20 and 5,15,25 Assume that traingle xyz is similar to triangle rpn with x(ray sign) r and p(ray ...
*November 16, 2013 by BARBIE LEE*

**Math "Need Help Asap"!**

Geometry Unit Practice Sheet Multiple Choice Use the figure to answer questions 13. 1. Name a pair of complementary angles. (1 point) 1 and 4 1 and 6 3 and 4 4 and 5 2. If m1=37, what is m4? (1 point) 53 43 37 27 3. If m1 = 40, what is m5? (1 point) 50 40 35 25 Use ...
*December 17, 2015 by Markest Lee*

**geometry**

the base of an isoscels triangle is 4x long. the altitude to the base is 3x cm long. Find the length of one other side of the triangle
*February 23, 2012 by sara*

**Math Geometry**

A triangle has vertices P(a,b), Q(c,d), and R(e,f). You are asked to prove that the image triangle angle P'Q'R' of triangle angle PQR after reflection across the y-axis is congruent to the preimage. What coordinates should you use for the vertices of triangle measurements P'Q'...
*January 28, 2009 by Tracy*

**Calculus**

An isosceles triangle, whose base is the interval from (0,0) to (c,0), has its vertex on the graph of f(x)=12-x^2. For what value of c does the triangle have maximum area?
*January 24, 2008 by Anonymous*

**math**

The perimeter of an isosceles triangle is 16 in. The area of the triangle is 12 sq in. If the base is x in, the height is 4 in and the legs are y in, find the length of the three sides.
*January 5, 2012 by Beatrice*

**trigonometry**

an isosceles triangle is inscribe in aradius 100 in .find the angles of the triangle if it is base subtends an arc of 143.7 in
*November 28, 2012 by jophy*

**maths**

the base if an isosceles triangle is 4/3cm. the perimeter of the triangle is 4 2/15cm. what is the length of either of the remaining equal sides
*April 11, 2015 by Anonymous*

**math**

In any triangle the sum of the measures of the angles is 180. In triangle ABC, A is three times as large as B and also 16 larger than C. Find the measures of each angle. I also would like to know how to solve these problems: In isosceles trapezoid ABCD, the longer base, AB is ...
*October 4, 2008 by Faye*

**math please help **

Medians line AX and line BY of triangle ABC are perpendicular at point G. Prove that AB = CG. In your diagram, <AGB should appear to be a right angle. Not sure what i need to do for this...
*April 23, 2015 by Jenna*