Bonjour,
volume pyramide:
(aire base * h)/3
(7*7*12)/3 = 196 cm³
volume cône:
(aire base *h)/3
(3,14 * 8² *18)/3 = 1 205, 76m³
volume pavé:
L*l*h
4,2* 7 * 9,5= 279,30cm³
volume cylindre
aire base *h
3,14 * 8² * 18 = 3 617, 28 cm³
Exercice 5
Pythagore :
(5x+15)² = (3x+9)² + (4x+12)²
(5x+15)² = 25x² +150x + 225
(3x+9)² + (4x+12)² =
9x² +54x + 81 + 16x² +96x + 144 =
25x² + 150x + 225
25x² + 150x + 225= 25x² + 150x + 225
RST est rectangle
