Diketahui lingkaran berjari jari 21cm dengan sudut pusat 30°
Hitunglah: a) luas juring
b)panjang busur
Hitunglah: a) luas juring
b)panjang busur
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a.Luas Juring
= a/360 × πr²
= 30/360 × 22/7 × 21²
= 1/12 × 22 × 63
= 1.386/12
= 115,5cm²
b.Panjang busur
= a/360 × 2πr
= 30/360 × 2 × 22/7 × 21
= 1/12 × 2 × 22 × 3
= 11cm
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Mapel : Matematika
Materi : Lingkaran
Kode : 8.2.7