Penjelasan dengan langkah-langkah:
sudut AOB = 360° × Luas Juring OAB
panjang OA² x π
sudut AOB = 360° × 147π
21² × π
sudut AOB = 360° × 21 × 7
21 × 21
sudut AOB = 360°
3
sudut AOB = 120°
Panjang busur AB = 120° × π × 2 × OA
360°
Panjang busur AB = ⅓ × π × 2 × 21
Panjang busur AB = ⅓ × π × 42
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Penjelasan dengan langkah-langkah:
sudut AOB = 360° × Luas Juring OAB
panjang OA² x π
sudut AOB = 360° × 147π
21² × π
sudut AOB = 360° × 21 × 7
21 × 21
sudut AOB = 360°
3
sudut AOB = 120°
Panjang busur AB = 120° × π × 2 × OA
360°
Panjang busur AB = ⅓ × π × 2 × 21
Panjang busur AB = ⅓ × π × 42
Panjang busur AB = 14π cm