Question

qual valor do angulo a??​

Answer 1

$2x + 50 + 5x - 10 = 180 \\2x + 5x = 180 + 10 - 50 \\ 7x = 140 \\ x = \frac{140}{7} \\ x = 20$

$a = 2x + 50 \\ a = 2.20 + 50 \\ a = 40 + 50 \\ a = 90$