Respuesta :
Answer:
∠B = 89°
Step-by-step explanation:
- supplementary angles are two angles whose sum is 180°
∠A + ∠B = 180°
x - 18 + x - 20 = 180
x + x = 180 + 18 + 20
2x = 218
x = 218/2
x = 109
∠B = 109 - 20 = 89
∠B = 89°
Answer:
∠B = 89°
Step-by-step explanation:
∠A + ∠B = 180°
x - 18 + x - 20 = 180
x + x = 180 + 18 + 20
2x = 218
x = 218/2
x = 109
∠B = 109 - 20 = 89
∠B = 89°