Tolong dong nomor 20.. Thank you yaaa​

Jawab:

d. 18°

Penjelasan dengan langkah-langkah:

∠AEB, ∠ADB, ∠ACB = sudut keliling = 1/2 x sudut pusat = 1/2 x ∠AOB

∠AEB + ∠ADB + ∠ACB = 78°, ∠AOB = (3x-2)°

1/2(∠AOB + ∠AOB + ∠AOB) = 78°

1/2(3∠AOB) = 78°

3∠AOB = 156°

∠AOB = 156/3 = 52°

(3x-2)°= 52°

3x = 52 + 2 = 54

x = 54/3 = 18° (D)