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d(diameter) = 42 cm
r(jari-jari) = d/2 = 42/2 = 21 cm
π = 22/7
V(Volume) = ? cm^3
V = 4/3 × π × r^3
= 4/3 × 22/7 × 21^3
= 4 × 22 × 21^3/21
= 88 × 21^2
= 88 × 441 = 38.808 cm^3
^ = pangkat
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