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r = 7 cm
maka
K = 2πr
= 2 · 22/7 · 7
= 44 cm
maka
∩AB = 120/360 × K
= 1/3 × 44
= 14 2/3 cm
Jawab : D
Nomer 10
r = 7 cm
maka
L = πr²
= 22/7 · 7 · 7
= 154 cm²
maka luas buusur,
L AOB = 60/360 · L
= 1/6 · 154
= 25 2/3 cm²
Jawab : A
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