Réponse :
bonsoir,
Vpyramide = 1/3 × Abase × h
V = 1/3 × (8×1) × 7
V = 1/3 × 8 × 7
V = 56/3 cm³
V ≈ 18.67 cm³
Vgros-cône = 1/3 × π × r² × h
V = 1/3 × π × 3² × 4
V = 1/3 × π × 9 × 4
V = 1/3 × π × 36
V = 36/3 × π
V = 12π cm³
V ≈ 37.7 cm³
Vpetit-cône = 1/3 × π × r² × h
V = 1/3 × π × 1.5² × 3.6
V = 1/3 × π × 2.25 × 3.6
V = 8.1/3 × π
V = 2.7π cm³
V ≈8.58 cm³
Vpyramide(ABCS) = 1/3 × Abase × h
V = 1/3 × ( (34×30)/2 ) × 26
V = 1/3 × 1020/2 × 26
V = 1/3 × 510 × 26
V = 13260/3
V = 4420 cm³
voila:)
