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Verified answer
Materi : LingkaranKelas : 8 SMP
11. ∠ AOB = 20°
∠ AOD = 180 - ∠ AOB
= 180 - 20
= 160°
sudut keliling
∠ ACD = 1/2 × ∠ AOD
= 1/2 × 160°
= 80°
12. sudut reflek AOC = 360 - 150
= 210°
∠ ABC = 1/2 × ∠ AOC
= 1/2 × 210
= 105°
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