yang no.37 gimana caranya

Bab Garis dan Sudut
Matematika SMP Kelas VII

x + x + 60° = 180°
2x = 180° - 60°
x = 120° : 2
x = 60°

a] ∠BOC = x + 60°
∠BOC = 60° + 60°
∠BOC = 120°

b] ∠AOB = x = 60°

c] ∠AOD = ∠BOC = 120° (bertolak belakang)

d] ∠BOD = 180° (sudut lurus)