Jika panjang jari jari bola 21cm Hitunglah. A.luas bila B.volume bola

a. L bola = 4 × phi × r^2
= 4 × 22/7 × 21 × 21
= 5544 cm^2

b. Vbola = 4/3 × phi × r^3
= 4/3 × 22/7 × 21 × 21 × 21
= 38.808 cm^3

Luas = 4pi r² = 4 * 22/7 * 21*21 = 4*22*3*21= 5544 cm²

Vol
= 4/3 pi r^3
= 4/3 * 22/7 * 21*21 *21
= 88*21*21
= 38.808 cm^3