Question

A) 36 cm.
B) 38 cm.
C) 56 cm.
D) 76 cm.
E) 94 cm.

Answer 1

Vamos là.

AE = BE

5x - 7 = 2x + 20

5x - 2x = 20 + 7

3x = 27

x = 9

DE = x = 9

AE = 5x - 7 = 45 - 7 = 38

BE =2x + 20 =  18 + 20 = 38

comprimento total.

2DE + AE + BE = 18 + 38 + 38 =76 + 18 = 94 cm (E)