Question

Given Triangle DEF is isosceles and angle D is the vertex angle, Find x, DE, DF, EF

Answer 1

x=2;DE,EF=9,DF=5

Explanation:

Since DEF is isoceles, you can set the equations

x+7 and 2x+5 equal to each other

x+7=2x+5, now solve for x

-x=-2,

x=2, now plug in for each side

DE,EF=9

DF=3(2)-1=5