= 90°/360° × 2πr
= 1/4 × 2 × 22/7 × 7
= 1/2 × 22
= 11 cm
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Panjang Busur AB
= 90°/360° × 2πr
= 1/4 × 2 × 22/7 × 7
= 1/2 × 22
= 11 cm