Question

qual o valor de x na figura abaixo?


A) 8°
B)13°
C)19°
D)28°​

Answer 1

(2x + 2) + (7x + 6) + [180 - (8x + 21) = 180

2x + 2 + 7x + 6 + 180 - 8x - 21 = 180

2x + 7x - 8x + 2 + 6 + 180 - 21 = 180

x + 167 = 180

x = 180 - 167

x = 13 graus