Thursday
October 23, 2014

Search: Prove that angle ABC is a isosceles triangle,if the altitude AD BISECTS THE BASE BC

Number of results: 24,865

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
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

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

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

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
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

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
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
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
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

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

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

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

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

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

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

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

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

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 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

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

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

Geometry
Indirect Proofs Prove a triangle cannot have 2 right angles. 1) Given triangle ABC. 2) Assume angle A and angle B are both right angles is true by one of two possibilities (it is either true or false, so we assume it is true) This is my first time to do indirect proofs, so if ...
November 18, 2010 by chica

Geometry
In triangle abc angle a=3x+40 angle b= 8x+35 and angle c=10x Which is the longest side of the triangle, ab, ac or bc?
April 12, 2012 by Mirielle

geometry
In an isosceles triangle, the measure of the vertex angle is 4x. The measure of each base angle is 2x + 10. What is the actual measure of the vertex angle?
August 8, 2010 by monique

Geometry
the legs of an isosceles triangle have lengths 2x+4 and x-8 the base has length 5x-2 whats teh lenght of base
December 1, 2011 by Purple

Math
Could anyone help me udnerstand the base angle theorem and the converse base angle theorem better?..I don't wuite understand them, and I have homework on it. Marie: The base angle theorem: If in a triangle two of the side are equal length, then the angles opposite the sides ...
December 19, 2006 by Marie

geometry
You have isosceles triangle WXY and segment WZ is the perpendicular bisector of segment XY. You have to prove triangle WXY isosceles in only three steps using the theorem: If a point is on the perpendicular bisector of a segment, then it is equidistant from the endpoints of ...
November 10, 2010 by Michele

Geometry
Ray BD bisects angle ABC. Find angle ABD if angle ABD = (6x+4) degrees and angle DBC = (8x-4) degrees
September 10, 2012 by Victoria

math
the perimeter of an isosceles triangle is 30 inches. the legs are 1/3 as long as the base. set up an equation to find each side length of the triangle.
November 17, 2008 by jazz

geometry
The perimeter of an isosceles triangle is 42 cm . its base is 2/3 times the sum of the equal sides . find the length of each side and the area of the triangle.
December 30, 2010 by saurav kumar

math geometry
what conclusion states the equality of the measures of two angles for CD bisects angle ABC?
June 3, 2012 by rebecca

Geometry
ABC is an isosceles triangle where AB = AC and BC = 60. D is a point on BC such that the perpendicular distance from D to AB and AC is 16 and 32, respectively. What is the length of AB?
March 26, 2013 by Dan

Maths
wHAT IS A TRIANGLE WITH TWO SIDE EQUAL CALLED? isosceles triangle Isosceles Triangle
November 24, 2006 by Samantha

calculus optimization max min
find the dimensions of the rectangular area of maximum area which can be laid out within a triangle of base 12 and altitude 4 if one side of the rectangle lies on the base of the triangle thanks
October 19, 2010 by Oswaldo

geometry
Basic Geometry 1. Find the perimeter of a rectangle 19 cm long by 27.8 cm wide. 2. In triangle ABC, angle A = 47, and angle B = 8. Find angle C. 3. Find the perimeter of a triangle with sides of length 28 cm, 47 cm and 19 cm. 4. In triangle FGH, angle F = 32, and angle G = ...
March 1, 2011 by shirley

geometry
The measure of an exterior angle of an isosceles triangle is x degrees. What are the possible angle measures of the triangle in terms of x? Describe all the possible values of x.
November 6, 2011 by Anonymous

geometry
can one tell if two triangles are congruent if they are given only the angles and all of them are congruent to one another? (Example below) triangle ABC and triangle DEF with angle A congruent to angle D, angle B congruent to angle E, and angle C congruent to angle F
October 6, 2008 by Casey

geometry/trigonometry
Triangle ABC is similar to triangle APQ with angle CBA equal to angle QPA and angle A common to both triangles. the length of sides AB, AP and PQ are 90cm,60cm and 30 cm. calculate the length of the side BC
June 20, 2010 by lee pearce

Genius Math
Triangle ABC has AC=BC, angle ACB=96 degrees. D is a point in ABC such that angle DAB=18 degrees and angleDBA=30 degrees. What is the measure in degrees of angle ACD? I got 42 degrees!
December 24, 2013 by Anonymous

Math
In right triangle ABC, altitude CD is drawn to hypotenuse AB. If AD equals 4 and AC exceeds DB by 1, find DB. It is from a worksheet about proportions in a right triangle.
February 21, 2010 by Emily

Analytic geometry - finding point by intersect lin
I have a triangle ABC. The slope of AB is -1/ab, the slope of AC is -1/ac, and the slope of BC is -1/ac. My question is, I have 3 lines: Altitude from A to BC, altitude from B to AC, and altitude from C to AB. I know their slope because it is just -1/slope. But I want to know ...
March 5, 2013 by Knights

maths
In triangle abc, angle abc= deg,bc= and ab=(+10) ;find the value of x
April 19, 2014 by johan

geometry
In triangle ABC, AB=5 cm, BC=12 cm and angle ABC=90 degree, calculate the length of AC.
September 28, 2014 by Bhuvanesh. D

trigonometry
In the triangle ABC, the sides AB and BC have lengths 7cm and 8cm respectively, and angle B is obtuse. the area of the triangle is 14 root 3 cm^2. Find a.The size of angle B b. The length of AC
May 3, 2012 by lindsay

Trigonometry
triangle ABC is isosceles, with AB=AC=15cm , and m<A = 150. What is the exact length of BC without using trigonmetry?
December 1, 2012 by Rachel

Geometry
Given: angle ABD is a right angle , angle CBE is a right angle. Prove: angle ABC is congruent angle DBE
September 29, 2011 by Sam

algebra-trig help asap
An isosceles triangle has a base 36 cm long and a base of 65 degrees. Find its perimeter. I'm not sure if this is right but my answer is 1250.4 in^2
May 5, 2012 by missy

Math - Trig
1. Find the altitude of an isocles triangle having base 184.2 cm if the angle opposite the base is 68deg 44' 2. A 13.5m fire truck ladder is leaning against a wall. Find the distance d the ladder goes up the wall (above the top of the fire truck) if the ladder makes an angle ...
November 27, 2013 by McKenna Louise

GEOMETRY
Which statement is contrapositive of the conditional: If a triangle is isosceles, then it has 2 congruent sides. 1. If a triangle does not have 2 congruent sides, then it is not isosceles. 2. If a triangle is isosceles, then it does not have 2 congruent sides. 3. If a triangle...
February 20, 2012 by Tyler

Geometry
1. If ΔRST symbol ΔNPQ, then RT line is congruent to _____. (1 point) line NP line NQ line PQ line QP 2. Given RST NPQ, RT = 7x 5, NQ = 5x + 11, find the length of RT and of NQ. (1 point) 8 51 40 56 3. Which of the following statements is true about the triangles ...
December 5, 2013 by hi

geometry!
ABC is an isosceles triangle with AB=AC, ∠BAC=96∘. D is a point such that ∠DCA=48∘, AD=BC and angle DAC is obtuse. What is the measure (in degrees) of ∠DAC?
February 18, 2013 by please help me out!!!!

MATHS,7TH CLASS
A RIGHT ANGLED TRIANGLE ABC IS GIVEN,WHERE AB IS 5CM,AC IS 12CM,BC IS 13CM,AD IS AN ALTITUDE FROM A TO BC,FIND THE AREA OF THE TRIANGLE AND FIND AD ALSO.
February 19, 2011 by ANNANYA

geometry
in triangle abc angle a is (3x+40) angle b is (8x+35) and c is 10x what is the longest side of the triangle
February 7, 2012 by Anonymous

math
In a triangle ABC , the internal bisectors of angles B and C meet at P and the external bisectors of the angles B and C meet at Q. prove that: angle BPC + angle BQC = 2 rt. angles.
July 27, 2012 by sunny

geometry
In a triangle ABC , the internal bisectors of angles B and C meet at P and the external bisectors of the angles B and C meet at Q. prove that: angle BPC + angle BQC = 2 rt. angles.
July 27, 2012 by sunny

geometry
An isosceles triangle has a perimeter of 147 inches.Each of the two equal lenghts is three times as long as the base.find the length of the base
July 14, 2010 by rally

Advanced Maths (Vectors) AQA Level
Triangle ABC with D, E and F the midpoints of BC, AC, and AB. G is the midpoint of AD such that the ratio AG:GD =2:1, VECtors AB =p and BC =q Prove that B, G and E are collinear. prove the same results for point C, G and G
February 12, 2012 by Jat

Advanced Maths (Vectors) AQA Level
Triangle ABC with D, E and F the midpoints of BC, AC, and AB. G is the midpoint of AD such that the ratio AG:GD =2:1, VECtors AB =p and BC =q Prove that B, G and E are collinear. prove the same results for point C, G and F
February 12, 2012 by Jat

math 8
the measure of one angle of MNO is 90 . This means that the triangle can be classified as a ? triangle Right triangle or a isosceles or scalene is this right?
May 21, 2012 by codey

geometry(triangle)
Triangle ABC is a right triangle with ∠ABC=90∘. P is a point within triangle ABC such that ∠APB=∠BPC=∠CPA=120∘. If PA=15 and PB=6, what is the value of PC?
February 25, 2013 by can u do it????

math/geometry
What are the surface areas of this two figures? a) a triangular pyramid with base of 5 cm, an altitude of the base of 8.7 cm and a slant height = 6.9 cm b) a square pyramid with a slant height of 5.2cm and an altitude of the triangle of 9cm.
November 11, 2008 by katie

math
triangle ABC and triangle DBC on the same base BC and angleA
August 16, 2011 by sachu

geometry
Triangle ABC has the following angle measures. Angle A = 44. Angle B = 4x. Angle C = 2x + 16. Find the measure of angle C.
December 16, 2010 by jess

heeeeeeelp geometry
In a triangle ABC, BK is an angle bisector. A circle with radius 5/3 passes through the vertex B, intersects AB at a point L, and is tangent to AC at K. It is known that the length of AC is 3√3, and the ratio of the lengths |AK| to |BL| is 6:5. The area of the triangle ...
June 1, 2013 by andrew

Math
An isosceles triangle and a rectangle share a base. The area of the rectangle is 4 times the area of the triangle. The area of the triangle is 60 cm^2 and its height is 15 cm. Find the dimensions of the triangle.
February 11, 2011 by Mary

Geometry
Triangle DEF is an isosceles triangle with DE = FE. If DE = 5 and D = 75 degrees: what is the length of FE, the measure of angle F, and the measure of angle E? E D ∆ F
June 16, 2011 by Phillip

college algebra
an isosceles triangle has at least two sides of equal length. Determine whether the triangle with vertices (0,0), (3,4),(7,1) is isosceles.
February 2, 2012 by john

geometry
The perimeter of a triangle ABC is 58cm.The base of the right triangle is 17 cm. What is th area of the right triangle and how do you figure it out?
April 20, 2011 by leah

math help mepls
Triangle ABC has an obtuse angle at B, base BC has length equal to 30 and height equal to 24. (This height is taken with respect to base BC). D is a point on the line segment BC and E is a point on AC such that DE∥AB. F is a point on AB such that FD∥AC. As D varies...
June 7, 2013 by clavin

Hard Geometry Problem
Hi guys. I need a lot of help on this. "Equilateral triangle ABC has centroid G. Triangle A'B'C' is the image of triangle ABC upon a dilation with center G and scale factor -2/3. Let K be the area of the region that is within both triangles. Find K/[ABC]." How do you get a ...
August 1, 2014 by Sheenybeany

Math
If triangle ABC is similar to triangle DEF and the scale factor is 1:2 correspondingly, what is the measure of angle D is the measure of angle A is 45 degrees? Explain how you determined the measure of angle D.
January 24, 2013 by Lalala

geometry
Algebra BD bisects <ABC. Solve for x and find m<ABC. m<ABD = 4x - 16, m<CBD = 2x + 6 Please teach me how to work this.
September 14, 2012 by Jane

math
ABC is a right-angled triangle atB. AB=(3x+2)cm and BC=2CM.GIVEN THAT THE AREA OF THE TRIANGLE IS 85CM SQUARE FIND THE VALUE OF X. Say that the height= 3x+2 base= 2 Area of a triangle equals 1/2 base times height so... (1/2) of the base is 1 and 1 times the height (3x+2) is 3x...
July 4, 2007 by c

calculus
A rectangle is inscribed in an isosceles triangle. If the sides of the triangle are 10, 10 and 12, what are the dimensions of the rectangle having the greatest area? The diagram shows the triangle on a set of axes with base 12 on the x axis and the top vertices on the y axis.
December 11, 2011 by Tina

math
In triangle ABC, AB=2 square root 2, BC=8,angle ABC=45 degrees.Find area ABC. a. 4 square 2 b. 8 c. 8 square 2 d. 16 e. 16 square 2 please answer and explain
May 9, 2014 by thomas

Math (Geometry)
Given: ABCD is arhombus. prove:AC bisects angle BAD and angel BCD.
March 21, 2013 by bhfewbidsukj

math
in triangle abc angle b is 5x angle a and c is 16 degree less than 4 times angle a the size of angle a b c in decimal is
March 23, 2011 by elaine

math
Base of a triangle is 12 inches longer than twice the length of altitude x. Write polynomial area of triangle.
November 11, 2011 by Alice

geometry
Given: ABCD is a rectangle, diagnoals AC and BD intersect at E Prove: Triangle AEB is isosceles
April 13, 2009 by Sam

Math
Given a circle with chord AB and diameter CD, prove that triangle ABD is isosceles if AB is perpendicular to CD.
September 27, 2010 by Peter

Math--Please help
Prove that no isosceles right triangle exists whose sides are integers.
February 2, 2013 by Barb

Algebra, HELP! PLEASE!
In triangle ABC, angle B is four times as large as angle A. The measure of angle C is 12∘ more than that of angle A. Find the measures of the angles.
September 7, 2013 by Kate

geometry
Suppose right triangle ABC has one acute angle 47. Suppose also that right triangle DEF has an acute angle 43. How are triangles ABC and DEF related?
September 20, 2011 by Blanca

Geometry
Can anybody help me with this word problem? A homeowner, who loves math, decides to make a garden/patio area in the following way. She decides to make the gardening area, where she will plant roses bushes in the shape of an equilateral triangle having a side length of 10 feet...
October 8, 2014 by Jonas

Geometry
D is the mid-point of side AB of the triangle ABC, E is mid-point of CD and F is mid-point of AE. Prove that: Area (triangle AFD) =Area (triangle ABC).
January 18, 2011 by Aman

Pre-Cal
1) Solve the equation exactly for x: log3 x - log3(x-3) = 2 I got 1 as an answer. Is this correct? 2) Find the cotangent of the base angle of an isosceles right triangle. sqrt3 / 2. Is this correct?
March 10, 2010 by Abbey

Summer Creek
An isosceles triangle has legs that are each x inches long a base that is y inches long. The perimeter of this triangle is 38 inches. The base is 8 inches shorter than the length of a leg.
June 15, 2013 by Heaven

Pages: <<Prev | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | Next>>

Search
Members