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r = 5
phi = 3.14
t = 8
V = phi * r * r * t
= 3.14 * 5 * 5 * 8
=15.7 * 5 * 8
= 78.5 * 8
= 628 cm³
t =8
dit : V = .......?
penye :
V = π × r² × t
= 3,14 × 5 × 5 × 8
= 3,14 × 25 × 8
= 3,14 × 200
= 628 cm³