Salut
aire ABCD = AD × AB = 7(x+1) = 7x+7
aire CDE = CE × CD ÷ 2 = 4(x+1) ÷ 2 = 2x+2
aire ABED = aire ABCD + aire CDE
= 7x+7+2x+2
= 9x+9
si x=2
aire ABED = 9(2)+9 = 27 cm²
