Bonjour,

aire triangle: (2*x)/2 = xcm²

Aire rectangle:

7*2 = > 14cm²

Aire 1/2 cercle:

(Pi*1²) /2

aire totale :

x+ [ 14 - (Pi*1²)] /2

pi = 3,14

x+ [ 14 - (3,14*1²)/2]

= x+ (14 -3,14)/2

=> (x + 5,43)cm²

x= 3

3+ 5,43 => 8,43cm²  => 8,4cm²