tolong bantu no 13 dan 14

Bab Bangun Datar
Matematika SMP Kelas VII

13]
∠AOB = sudut pusat
∠AOB = 2 x ∠AEB
∠AOB = 2 x 38°
∠AOB = 76°

∠ADB = ∠AEB = sudut keliling = 38°
∠ADB + ∠AOB = 38° + 76° = 114°

jawabannya C

14] ∠BAD + ∠BCD = 180°
x + 15° + 4x = 180°
5x = 180° - 15°
x = 165° : 5
x = 33°

∠BAD = x + 15°
∠BAD = 33° + 15°
∠BAD = 48°

jawabannya D