13.) Tentukan luas permukaan bola berikut! (π = 22/7)

A.) 1.232 cm²
B.) 2.464 cm²
C.) 11.499 cm²
D.) 17.248 cm²

13.) Tentukan luas permukaan bola berikut! (π = 22/7)

LP = 4πr²

LP = 4 × 22/7 × 14 × 14

LP = 4 × 22 × 2 × 14

LP = 4 × 44 × 14

LP = 4 × 616

LP = 2.464 cm² → (B)

Dik : r = 14cm

Dit : Lp?

Jawab :

$tt Lp = 4 × pi × {r}^{2} \ tt =4 times frac{22}{7} times 14 times 14 \ tt = 4 times 22 times 2 times 14 \ tt = 2.464 {cm}^{2}$

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B.) 2.464 cm²