Tolong jawab sama caranya!
Jawaban Terkonfirmasi
13)
misal titik pusat=O
∠BAC=∠BOC/2
=180°/2
=90°
∠BAC+∠ACB+∠ABC=180°
90°+4x+5x=180°
9x=180°-90°
x=90°/9
x=10°
∠ABC=5x
=5(10°)
=50°(D)
14)
∠ACB=4x
=4(10°)
=40°(C)