1. π × R² × h = π × 5² × 15
= 25π × 15
= 375π cm^3 ≈ 1178 cm^3
2. a. 1/3 × h × A(base) = 1/3 × 6 × 5² × π
= 1/3 × 150 × π
= 50π cm^3
b. V2 = V1 - VPetit cône
= 50π - [ 1/3 × 2 × (5/3)² × π ]
= 50π - [ 2/3 × (5/3)² × π ]
= 50π - 50/27π
= 1350/27π - 50/27π
= ( 1350 - 50 ) / 27π = 1300 / 27π ≈ 151,3 cm^3
