Réponse :
Bonsoir !
Exercice 5
a. Pyramide
Aire Base = c × c
Aire Base = 3,5 × 3,5
Aire Base = 12,25 cm²
V = 1 / 3 × b × h
V = 1 / 3 × 12,25 × 5
V = 20,41666667 ≈ 20,42 cm³
b. Cône
Aire Base = r² × π
Aire Base = 4,5² × π
Aire Base ≈ 63,62 cm²
V = 1 / 3 × b × h
V = 1 / 3 × 63,62 × 2
V = 42,41150082 ≈ 42,11 cm³
Exercice 6
a. Cône
Aire Base = r² × π
Aire Base = 2² × π
Aire Base = 4π
V = 1 / 3 × b × h
V = 1 / 3 × 4π × 5
V = 20π / 3 ≈ 20,94 cm³
b. Pyramide
Aire Base = L × l
Aire Base = 4,5 × 3
Aire Base = 13,5 cm²
V = 1 / 3 × b × h
V = 1 / 3 × 13,5 × 2
V = 9 cm³
Voilà ;)
