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volume bola = 36π cm³
ditanya : luas permukaan bola ?
jawab:
jari jari (r) ?
v bola = 4/3πr³
36π = 4/3πr³
r³ = 36π : 4/3π (coret π)
r³ = 36 x 3/4
r³ = 27
r = ³√27
r = 3 cm
jadi,
luas permukaan bola:
= 4πr²
= 4 x 3,14 x 3 cm x 3 cm
= 113,04 cm²