hitunglah panjang busur AB dan CD jika r:28 cm,sudut AOB:45°,dan sudut COD :90°
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Pertanyaan
hitunglah panjang busur AB dan CD jika r:28 cm,sudut AOB:45°,dan sudut COD :90°
1 Jawaban
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1. Jawaban FNAulia
Diket:
∠AOB = 45°
∠COD = 90°
r = 28 cm.
Dit:
∠AB = ?
∠CD = ?
Jawab:
∠AB = ∠AOB / 360° x 2 x π x r
∠AB = 45° / 360° x 2 x 22/7x 28
∠AB = 45° / 360 x 176
∠AB = 22 cm.
∠CD = ∠COD / 360° x 2 x 22/7 x 28
∠CD = 90/360° x 2 x 22/7 x 28
∠CD = 44 cm.