Jika volume sebuah bola 38.808 cm3, hitunglah a. Diameter bola b. Luas permukaan bola tersebut
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Soal a v = 4/3 πr³ 38808 = 4/3 x 22/7 x r³ 38808 x 3/4 x 7/22 = r³ 29106 x 7/22 = r³ r³ = 1323 x 7 r³ = 9261 r = ∛9261 r = 21 cm d = 2r d = 2.21 d = 42 cm
soal b L.bola = πd² = 22/7 x 42 x 42 = 22 x 6 x 42 = 132 x 42 = 5544 cm²
v = 4/3 πr³
38808 = 4/3 x 22/7 x r³
38808 x 3/4 x 7/22 = r³
29106 x 7/22 = r³
r³ = 1323 x 7
r³ = 9261
r = ∛9261
r = 21 cm
d = 2r
d = 2.21
d = 42 cm
soal b
L.bola = πd²
= 22/7 x 42 x 42
= 22 x 6 x 42
= 132 x 42
= 5544 cm²