Friday

September 4, 2015
Number of results: 23,939

**math**

angle ABC and DEF are supplementary angles. the measure of DEF is 20 degrees less than 3 times the amount of ABC. what are ABC and DEF.
*January 24, 2013 by hunter*

**geometry**

Triangle ABC is similar to triangle DEF. The sides of ABC are 5,8 and 11. What is the length of the shorttest side of DEF if its perimeter is 60?
*June 18, 2013 by mily*

**geometry**

triangle abc is similar to def, the lengths of the sides of triangle abc is 5,8,11. what is the length of the shortest side of triangle def if its perimeter is 60?
*February 28, 2013 by c*

**geometry**

DEF and ABC are complementary angles and ABC is nine times as large as DEF. Determine the measure of each angle.
*June 27, 2012 by angela *

**GEOMETRY**

If ABC ~ DEF and the scale factor from ABC to DEF is 1/6, what are the lengths of DE,EF , and DF, respectively?
*February 26, 2014 by QUILO*

**geometry**

"Triangle DEF is similar to triangle ABC, and the length of side DE is 6 cm. The length of side AB is 2 cm. If the area of triangle ABC is 5 square cm, what is the area of triangle DEF?
*July 6, 2011 by Anonymous*

**Precalculus**

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...
*February 24, 2014 by John*

**geometry**

<DEF and <ABC are supplementary angles and <DEF is seven times as large as <ABC. Determine the measures of each angle. Students must show all work step by step to receive full credit.
*March 10, 2011 by Terri Search *

**algebra**

Triangles ABC and DEF are similar. Find the area of triangle ABC. Round your answer to the nearest tenth. the answer should be __________m^2 triangle abc has a 12m. triangle def has 12m and 18m.
*March 9, 2013 by sally*

**Algebra**

Triangles ABC and DEF are similar. Find the area of triangle ABC. Round your answer to the nearest tenth. Triangle ABC has a base of 12m. Triangle DEF has a base of 18m and height of 12m
*May 7, 2014 by Barb*

**Trigonometry/Geometry**

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 19, 2013 by Sam*

**Math**

If triangle ABC is similar to triangle DEF and the perimeter of ABC is 4 times greater than the perimeter of DEF , what is the relationship between the areas of the triangles?
*July 12, 2012 by DAN*

**geometry**

In similar triangles ABC and DEF, corresponding sides AB and DE equal 15 and 12, respectively. If the perimeter of triangle ABC=40, what is the perimeter of triangle DEF
*September 28, 2010 by Saw Phone Thet*

**algebra**

Triangles ABC and DEF are similar. Find the perimeter of triangle DEF. Round your answer to the nearest tenth.
*March 1, 2013 by sally*

**Math (Geometry)**

The perimeter of right triangle ABC is equal to the perimeter of isosceles triangle DEF. The lengths of the legs of the right triangle are 6 and 8. If the length of each side of the isosceles triangle is an integer, what is the greatest possible length for one of the sides of ...
*August 7, 2012 by ANONYMOUS*

**geomerty**

The following triangles, Ä ABC and Ä DEF, are congruent. abc 67.38degree 12cm lenght 22.62degree b5cm,l,13cm Find the lengths of all missing sides and measures of all angles for both triangles. Include correct units with each of your answers. First triangle: Second triangle: ...
*May 11, 2011 by kozy*

**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*

**Math**

How do I determine which two triangles on a graph are congruent. ∆QRS and ∆DEF or ∆ABC and ∆XYZ. i found the coordinates of both sets: QRS Q(-2,5), R(-2,1), S(-5, 1) DEF D(5,-5), E(5,-2), F(2,-2) or ABC A(4,5), B(6,2), C(2,2) XYZ X(-4,-5), Y(-6,-2), Z(-...
*December 30, 2014 by Marie*

**geometry**

if <def < abc then <def <abc
*October 14, 2009 by vanessa*

**MATH**

I entered the wrong coordinates in a previous question, i corrected down below. How do I determine which two triangles on a graph are congruent. ∆QRS and ∆DEF or ∆ABC and ∆XYZ. i found the coordinates of both sets: QRS Q(-2,5), R(-2,1), S(-5, 1) DEF D(5...
*December 31, 2014 by Marie*

**geometry**

Triangle ABC is congruent to triangle DEF. If the length of AB is 12 feet and the length of AC is 10 feet. Find the length of DE. can someone please help me on this question please and thank youu :)
*September 3, 2011 by Alexis*

**Math Geometry**

Geometry Question: Prove the symmetric Property for congruence of triangles. Given: ∆ABC≅ ∆DEF Prove: ∆DEF≅ ∆ABC
*May 18, 2011 by Reigel*

**geometry**

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

**algebra**

Triangles ABC and DEF are similar. Find the perimeter of triangle DEF. Round your answer to the nearest tenth. ab=4ft bc=6ft ac=5ft de=6ft ef= 9ft there is no feet given for df Please can anyone help me solve this with steps I don't understand how to do this. Thanking you in ...
*March 1, 2013 by sally*

**Math**

Reiny ..thanks for the formula and example. I tried it and i get that both sets of triangles are congruent but it is multiple choice with one answer. I dont know what i am doing wrong. How do I determine which two triangles on a graph are congruent. ∆QRS and ∆DEF ...
*January 1, 2015 by Marie*

**math**

The base of triangle ABC is one half the altitude.The altitude of triangle DEF is one half its base. If both triangles are equal in area, what is the ratio of the altitude of triangle ABC to the altitude of triangle DEF ? a. 1:4 b. 1:2 c. 1:1 d. 2:1 e. 4:1 please answer and ...
*April 19, 2014 by thomas*

**math**

The base of triangle ABC is one half the altitude. The altitude of triangle DEF is one half its base. If both triangles are equal in area, what is the ratio of the altitude of triangle ABC to the altitude of triangle DEF? a. 1:4 b. 1:2 c. 1:1 d. 2:1 e. 4:1 please answer and ...
*April 24, 2014 by thomas*

**Geometry.**

Triangles ABC and DEF are similar. If ∠ABC = 121°and ∠BCA = 35°, find the measure of angle FDE.
*June 3, 2015 by Summer.*

**geometry**

ABC is congruent to DEF AB = 11, BC = 14, CA = 20, FD = 4x - 12 Find x
*November 20, 2011 by T*

**Math: Finding m<A**

ABC~DEF m<B = 25', m<D = 45', m<E = 25' How do find m<A?
*March 29, 2013 by Michelle*

**Geometry**

Triangles ABC and DEF are congruent. The length of the line segment AB is 5 yards, the length of the line segment BC is 7 yards, and the length of the line segment CA is 9 yards.
*January 23, 2012 by dawn*

**Math**

I have 3 questions: 1) If ABC and DEF are three- digit numbers, which of the following could be the number of digits in the product of ABC and DEF? i. 4 ii. 5 iii. 6 I don't have the vaguest idea on how to do this and what type of math it is part of... My answer is 6 only but ...
*July 8, 2014 by Bethany*

**math**

Triangles ABC and DEF are similar. The similarity ratio of to is , AB = 40, BC = 25, and AC = 35. What is the perimeter of ?
*May 22, 2013 by angie*

**Math**

Find the missing sides of the similar triangles ABC and DEF. AC=2 AB=5 CB=? DF=4 FE=8 DE=?
*November 13, 2013 by Heather*

**Trig**

Its a 30-60-90 triangle there's a line in the center that= 10 a. What is the length of the hypotenuse of triangle ABC? b. What is the length of the shorter leg of triangle ABC? c. What is the length of the longer leg of triangle ABC?
*February 1, 2012 by BreAnne*

**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*

**UPDATE to Ms Sue**

If JKL is similiar to DEF and JKl has sides that are 11 times greater than those of DEF what is the relationship between the perimeters of the triangles A. They are equal. B.The perimeter of DEF is 11 times greater than the perimeter of JKL. C. The perimeter of JKL is 11 times...
*June 13, 2012 by Katie*

**Math**

the right triangle ABC, the altitude from vertex C divides the hypotenuse into two segments, one of length 2 and the other of length 16. Find the perimeter of triangle ABC.
*December 7, 2013 by Lily*

**dav**

the area of two similar triangle abc nd def are 15cm.sq nd 25cm.sq respectively.find the ratio of corresponding side
*September 15, 2014 by richa das*

**Geometry**

Given: Triangle ABC ~ Triangle DEF, m<A = 50o, m<D = 2x + 5y, m<F = 5x + y, and m<B = 102 - x. What is the measurement of <F?
*March 14, 2011 by mic*

**Geoometry Help: Find EF**

ABC~DEF AB = 36, BC = 24, DE = 48 m<B = 110', m<E = 110' EF = ? I think it's 68. Yes? Or is something else?
*March 29, 2013 by Michelle*

**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*

**maths**

D,E,F are the midpoints of a triangle ABC then what is the area of triangle DEF?
*March 26, 2012 by help me out it's urgent*

**Trig**

a. What is the length of the hypotenuse of triangle ABC? b. What is the length of the shorter leg of triangle ABC? c. What is the length of the longer leg of triangle ABC? angle A=60, angle B=30, angle C=90 the triangle has a height of 10
*February 3, 2012 by BreAnne*

**geometry**

describe the 2 transformations, the first followed by the second that combined will transform triangle ABC and triangle DEF. 23) A(-3,3), B(-3,1), C(0,1) D(6,6), E(6,2), F(0,2) 24)A(6,0), B(9,6), C(12,6) D(0,3), E(1,5), F(2,5)
*December 19, 2011 by Anonymous*

**Geometry**

If ∆ ABC ~ ∆ DEF, BC = 12 cm, EF = 10 cm, and AC = 18 cm, find DF.
*January 11, 2011 by Dave*

**Math**

If ∆ ABC ~ ∆ DEF, BC = 12 cm, EF = 10 cm, and AC = 18 cm, find DF.
*January 12, 2011 by James*

**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*

**geometry**

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

**geometry**

In the accompanying diagram, triangle ABCis similar to triangle DEF, AC = 6, AB = BC = 12, and DF = 8. Find the perimeter of triangle DEF. it an isoslese triangle 6 and 8 are both base my work 6+2=8 12+2=14 2(14)+6=p 24+6=28 I don't understand how to find the perimeter of ...
*July 16, 2015 by Samantha*

**heeeeeeeeeeelp math**

Triangle ABC has an obtuse angle at B, base BC has length equal to 30 and height equal to 24. 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 within line segment BC, what is the maximum ...
*June 6, 2013 by clavin*

**heeeeeeeeeeelp math**

Triangle ABC has an obtuse angle at B, base BC has length equal to 30 and height equal to 24. 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 within line segment BC, what is the maximum ...
*June 6, 2013 by clavin*

**Math (Geometry)**

In right triangle ABC, we are given that ∠ABC=90∘ and AC=34. D is a point on line segment BC such that BD=12,DC=18. What is the length of AD?
*April 29, 2013 by Bob*

**pre-algebra**

Assume that triangle ABC is congruent to triangle XYZ. If AB=12cm and BC=15cm, what is the length of segment YZ?
*March 30, 2010 by alondra*

**Math**

In rhombus DEFG, if m<DEF=60, and the shorter diagonal DF has a length of 7, find the length of the side of a rhombus.
*March 5, 2010 by Chris*

**maths**

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 8, 2013 by keshav*

**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*

**geometry**

In ΔABC, AB is of the length of , and AC is of the length of . The perimeter of ΔABC is 24. (a) AB = ___units. (b) AC = ___units. (c) BC =___ units
*March 11, 2010 by nini*

**English**

What could I use as a memory clue (or picture) for the following words? Evicted: Def. To force out. Requisitioned: Def. Demand, or urgently ask for something for military needs.
*August 23, 2008 by Tommy*

**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*

**English**

What could I use as a memory clue (or picture) for the following words? Requisitioned: Def. Demand, or urgently ask for something for military needs. Derogatory: Def. To make a remark that belittles someone else
*August 24, 2008 by Tommy*

**geometry**

Jim has put a fence along the side AC of the triangular patch of land shown below. A right angle triangle ABC is shown having length of one leg equal to 6 meters. The measure of angle ABC is 90 degrees. A fence is shown on the hypotenuse of the triangle. The length of the ...
*January 6, 2012 by sunny*

**math**

Triangle DEF with vertices D(2,5), E(1,-6), and F(-5,3) is translated 3 units right and 2 units down. Find the coordiantes of DEF.
*November 13, 2008 by Sha*

**math**

Right triangle DEF has sides that measure x, x, and x squared for the some value of x. What is the area of triangle DEF to the nearest 0.1 square unit?
*April 20, 2014 by Melissa *

**math (need help badly)**

the vertices of triangle DEF are D(5,12)and E(2,7) and F(8,4) Triangle DEF undergoes an enlargement with the centre ,O, and scale factors k.Its image is D`E`F` where D(5,12)arrow D`(7.5,18) a)How do i detremine the value of k
*May 23, 2008 by rita*

**Math**

An equilateral triangle ABC has AB=20√3. P is a point placed in triangle ABC and D,E and F are the foot of the perpendiculars from P to AB, BC and AC, respectively. If PD=9 and PE=10, what is the value of the length of PF? Please work the complete solution.
*April 22, 2013 by Watson*

**Math**

An equilateral triangle ABC has AB=20√3. P is a point placed in triangle ABC and D,E and F are the foot of the perpendiculars from P to AB, BC and AC, respectively. If PD=9 and PE=10, what is the value of the length of PF? Please work the complete solution.
*April 23, 2013 by Watson*

**geometry**

Complete the flow proof for a Hypotenuse-Angle Theorem. Given AC congruent DF, <C congruent <F. <B and <E are right angles. Prove triangle ABC congruent triangle DEF. Thanks for tutors.
*April 10, 2015 by chloe*

**Geometry**

ABC is an acute triangle with \angle BCA = 35 ^\circ. Denote the circumcenter of ABC as O and the orthocenter of ABC as H. If AO=AH, what is the value of \angle ABC (in degrees)?
*March 26, 2013 by Dan*

**maths**

ABC is an acute triangle with \angle BCA = 35 ^\circ. Denote the circumcenter of ABC as O and the orthocenter of ABC as H. If AO=AH, what is the value of \angle ABC (in degrees)?
*March 30, 2013 by rohit*

**maths**

ABC is an acute triangle with ∠BCA=35∘. Denote the circumcenter of ABC as O and the orthocenter of ABC as H. If AO=AH, what is the value of ∠ABC(in degrees)?
*March 30, 2013 by stranger*

**math**

The altitude of equilateral triangle ABC is 15. What is the length of a side of triangle ABC?
*May 9, 2015 by Tameka*

**geometry**

The altitude of equilateral triangle ABC is 15. What is the length of a side of triangle ABC?
*May 10, 2015 by Tameka*

**geometry**

In the diagram below, the length of the legs AC and BC of right triangle ABC are 6cm and 8cm, respectively.Altitude CD is drawm to the hypotenuse of triangle ABC. what is the lenght of AD to the nearest tenth of a centimeter?
*June 16, 2010 by Jacqueline*

**geometry**

In the accompanying diagram, triangle ABCis similar to triangle DEF, AC = 6, AB = BC = 12, and DF = 8. Find the perimeter of triangle DEF.
*July 16, 2015 by Anonymous*

**TO BOBPURSLEY**

def of average velocity = t^-1 (x - x0) (average velocity = t^-1(x-x0))t=(avearge velocity)t + x0= x - x0 + x0 = x = (average velocity)t + x0 x = (average velocity)t + x0 def of average velocity were costant acceleration is assumed = 2^-1(v0 + v) plug into x = (average ...
*June 18, 2009 by TO ]BOBPURSLEY*

**Physics**

def of average velocity = t^-1 (x - x0) (average velocity = t^-1(x-x0))t=(avearge velocity)t + x0= x - x0 + x0 = x = (average velocity)t + x0 x = (average velocity)t + x0 def of average velocity were costant acceleration is assumed = 2^-1(v0 + v) plug into x = (average ...
*June 19, 2009 by Physics*

**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*

**Maths**

triangle ABC is right angled at A. AD is perpendicularto BC. If AB= 5cm,BC= 13cm and AC=12 cm.find the area of triangle ABC. Also find the length of AD.
*December 6, 2011 by leon*

**Geometry **

Let ABC be any triangle. Equilateral triangles BCX, ACY, and BAZ are constructed such that none of these triangles overlaps triangle ABC. a) Draw a triangle ABC and then sketch the remainder of the figure. It will help if (triangle) ABC is not isosceles (or equilateral). b) ...
*March 19, 2015 by G*

**math**

Triangle ADE is proportional to Triangle ABC. The Length of DE is 20 Ft: the Length of AB is 6 ft. and the Length of BC is 8 Ft. What is the length of AD?
*February 25, 2014 by Anonymous*

**math**

Triangle ADE is proportional to Triangle ABC. The Length of DE is 20 Ft: the Length of AB is 6 ft. and the Length of BC is 8 Ft. What is the length of AD?
*February 25, 2014 by Stan*

**math, functions **

stefan has set up a right triangle EFG on the side of a river such that FG measures 20m and angle DEF measures 60 degrees. EG bisects angle DEF. determine the width of DG.
*November 20, 2011 by yess *

**def integrals**

find value of def integral with a=-2 and b=2sqrt(3) for integral i get 1/15 *((4+x^2)^(3/2)) (-8+3x^2) for value i get [1536- 64sqrt(2)]/15 but its' wrong. help please
*May 25, 2013 by Mikey*

**Geometry**

If in given triangle ABC, AB = 8 cm and BC = 6 cm, then what is the length of AC in the triangle ABC?
*October 18, 2013 by Anonymous*

**Geometry**

if m<GEF = 2x + 10, m<DEF = 5x- 10, and m<GED = 70, find m<GEF and m<DEF
*March 2, 2014 by Kylee*

**Math**

if m<GEF = 2x + 10, m<DEF = 5x- 10, and m<GED = 70, find m<GEF and m<DEF
*March 3, 2014 by Kylee*

**Math**

Trigonometry problem: The sides AB and AC of triangle ABC are of lengths 4 and 7 respectively. M is the midpoint of BC. AM is of length 3.5, Find the length of BC.
*July 23, 2011 by Kalia*

**MATH**

what is the relationship between the perimeters of the triangles A. They are equal. B.The perimeter of DEF is 11 times greater than the perimeter of JKL. C. The perimeter of JKL is 11 times greater then DEF. D. The perimeter of JKL is 121 times greater that DEF.
*June 13, 2012 by Katie*

**Update**

what is the relationship between the perimeters of the triangles A. They are equal. B.The perimeter of DEF is 11 times greater than the perimeter of JKL. C. The perimeter of JKL is 11 times greater then DEF. D. The perimeter of JKL is 121 times greater that DEF.
*June 13, 2012 by Katie*

**Centroids and Triangles - determining perimeter?**

Let G denote the centroid of triangle ABC. If triangle ABG is equilateral with side length 2, then determine the perimeter of triangle ABC. I drew the diagram, but it doesn't really help....
*March 27, 2013 by Knights*

**Geometry**

Angle DEF is similar to Angle HJK and the scale factor of angle DEF to anle HJK IS 5/2. If EF =15 FIND JK Here is what I came up with Am I correct 5/2 = EF/JK 5/2 =15/JK 5(JK)=30 JK=30/5 JK=6 Thanks much
*June 13, 2007 by DANIELLE*

**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**

in triangle ABC, BD bisects <ABC, <ABD = 4x + 6 and m<DBC = 5x -5. find the m<abc
*January 1, 2013 by Arooj*

**geometry**

A circle has a radius of 3 feet and a central angle DEF that measures 60°. What is the length of the intercepted arc DF? Use 3.14 for pi and round your answer to the nearest tenth.
*July 2, 2010 by ashley!(:*

**Geometry-PLEASE CHECK ANSWERS!**

In isosceles triangle DEF, DE=DF. Which of the following is true? 1) <D is congruent to <E 2) <F is congruent to <E 3) <D is congruent to <F 4) <D is congruent to <E which is congruent to <F Is the answer (3)? In triangle ABC, if line AB is congruent...
*February 23, 2010 by Laurie*

**6th grade vocab**

What does the word "predominant" mean? Oh and please don't give me a website with some big def. I am in 6th grade so I won't understand if the def. is big and long. It also helps if you use it in a sentence . . . just saying. :-D Thanks so much!
*April 13, 2009 by Noelle*

**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*

**Geometry - semicircle inside isosceles triangle**

Isosceles triangle ABC has sides of length AB=AC=25 and BC=40 . Find the area of a semicircle inscribed in triangle ABC with diameter along BC . Please help I do not know how to start....
*March 21, 2013 by Knights*

**yet another geometry question**

Points D, E and F are the midpoints of the sides of triangle ABC. If AD=6, CF=4 and the perimeter of triangle ABC = 30, then find BE. If D is between A&B, E is between B&C and F is between C&A, then the perimeter is 6+6+4+4 + (twice length of BE)= 30 Solve that.
*May 7, 2007 by mike*