Sebuah bola berdiameter 7 dm tentukan : a luas permukaan bola b volume bola
ekamiaww
Luas bola = 4πr² = 4.22/7.7/2.7/2 = 154 dm²
volume bola = 4/3πr³ = 4/3.22/7.7/2.7/2.7/2 = 359,33 dm³
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rizkakartika
D =7 dm = 70 cm r = 1/2 x 70 =35 cm l.permukaan = 4 \pi r² = 4x22/7x35x35 = 15400 cm² v.bola = 4/3 x \pi r³ = 4/3 x 22/7 x 35 x 35 x 35 =539000/3 =17966,67 cm³
volume bola = 4/3πr³ = 4/3.22/7.7/2.7/2.7/2 = 359,33 dm³
r = 1/2 x 70
=35 cm
l.permukaan = 4 \pi r²
= 4x22/7x35x35
= 15400 cm²
v.bola = 4/3 x \pi r³
= 4/3 x 22/7 x 35 x 35 x 35
=539000/3
=17966,67 cm³