Question

Calcule, em graus, a medida x indicada nas figuras a seguir:

Answer 1

$20+x+40=90$
$x+60=90$
$x=90-60$
$x=30$

$12x+10+5x=180$
$17x+10=180$
$17x=180-10$
$17x=170$
$\boxed{x=\frac{170}{17}}$
$x=10$

Answer 2

a) 20 + x + 40 = 90°
x = 90 - 20 - 40
x = 30°

b) 12x+ 10 + 5x = 180
5x + 12x = 180 -10
17 x = 170
x= 170
17
x = 10