bonsoir
périmètre = 2 a + 2 b = 221
a + b = 110.5
a = 110.5 - b
aire = ab
b ( 110.5 - b) = - b² + 110.5 b
- b² + 110.5 b = 2226
- b² + 110.5 b - 2226 = 0
Δ = 110.5² - 4 ( - 1 * - 2226) = 12210.25 - 8904 = 3306.25
x 1 = ( - 110.5 - 57.5) / - 2 = - 168/-2 = 84
x 2 = ( - 110.5 + 57.5) / - 2 = - 53/2 = 26.5
longueur = 84 et largeur = 26.5
P = 2 * 110.5 = 221
A = 84 * 26.5 = 2226