Réponse :
a) P(rectangle) = (L+l) × 2 = 12x + 22
b) A(rectangle) = (L×l) = (2x + 4) × (4x + 7)
c) A(rectangle) = (L×l) = 8x^2 + 30x + 28
d) P(rectangle) = (L+l) × 2 = 46
A(Rectangle) = (L×l) = 120
Explications étape par étape
a) P(rectangle) = (L+l) × 2
= (2x + 4 + 4x + 7) × 2
= (6x + 11) × 2
= 12x + 22
c) A(rectangle) = (L×l)
= (2x + 4) × (4x + 7)
= 6x^2 + 14x + 16x + 28
d) P(rectangle) = (L+l) × 2 = 12 × 2+ 22 = 46
A(Rectangle) = (L×l) = 8 × 2^2 + 30 × 2 + 28 = 120