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= 30 cm : 2
= 15 cm
La = π × r²
= 3,14 × 15²
= 3,14 × 225
= 706,5 cm²
V = La × t
= 706,5 cm² × 30 cm
= 21195 cm³
= 3,14 × 15 × 15
= 706.5 × 30
= 21.195 cm3