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Sagot :

a) A= 2 Xπ (R²+Rh)
=2 X π (5²+ 5 X 10)
= 6,28 (25+50)
=6,28 X 75
= 471

b). V = πh/3 X ( R² + RR’ + R’²)
= (πX12)/3 X (5 ² + 5X3 + 3 ²)
=12,56 X (25+15+9)
= 12,56 X 49
= 615,44

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