bonjour
7 x 2 = 14
aire figure = 14 cm²
2 ( 7 - x ) = - 2 x + 14
aire rectangulaire = - 2 x + 14
(3.14 x 1² ) / 2 = 1.57
aire demi disque = 1.57 cm²
2 x /2 = x
aire triangle = x
colorée = - 2 x + 14 - 1.57 + x = - x + 12.43
aire colorée = ( 47 - x ) ( 23 - x ) = 1 081 - 47 x - 23 x + x² = 1081 - 70 x + x²
