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2πr²
2 21 × 21
2 × 22 × 3 × 21 = 44 × 63
2772 cm²
b) volume bola =
21×21×21
44 × 22 × 21 ×21
88 × 441
38808 cm³
2. a. hitunglah diameter bola
luas permukaan bola = 4πr²
200,96 = 4. 3,14 . r²
200,96 = 12,56 r²
r² =
r = √16
r = 4
d= 2r
d= 2.4 = 8 cm