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:)

Bonsoir j'espère que vous allez bien :)