In triangle def, if angle d is congruent to angle e, de= x + 4, ef= 4x - 8, and df= 7x - 35 find x and the measure of each side

ANSWER

Find out X and the measure of each side.

To proof

the diagram is given below

As given

angle D is congruent to angle E,

thus by using the property

if the two angle are equal to eachother than their opposite sides are also equal.

i.e

EF = DF

as given

DE= X + 4, EF= 4X - 8, DF = 7X-35

thus

4X -8 = 7X -35

solve

-3X = -27

X = 9

therefore

DE= X + 4

   = 9 + 4

   = 13 unit

EF= 4X - 8

    = 36 -8

    = 28 unit

DF= 7X - 35

    = 63 -35

    = 28 unit

Hence proved

think the answer is 30 degrees. if not than it is 20 degrees. not 100% sure. let me know if it was right.

gill russ