Question

calcule as medidas dos ângulos

Answer 1

a)
5x + 10 + 4x - 10 = 180°
9x = 180
x = $\frac{180}{9}$
x = 20°

b)
2y + 15° + 40° + x + y = 180°
3y + x + 55° = 180°
3y + 20° + 55° = 180°
3y = 180° - 55° - 20°
3y = 105°
y = $\frac{105}{3}$
y = 35°