Question

7. Calcula: "O"; si: x-y=10°.
a) 20°
b) 10°
c) 30°
d) 40°
e) 50°​

Answer 1

$x - y = 10 \\ x + y = 270 \\ 2x = 280 \\ x = 140$

-> O + x = 180

O + 140 = 180

O = 40 ⭐