Réponse :
Bonjour ,
Explications étape par étape
a) Perim. rectangle :(( p+1,5)+3)x2 = (p+4,5) x2
= 2p+9
b) perim. rectangle +perim. demi cercle =
( 2+y)x2 + [tex]\pi[/tex]y/2 =4 +2y +1/2y[tex]\pi[/tex] =5/2y[tex]\pi[/tex] +4
c) p1 +p2 = (3d +x)x2 + (c+d)x2 =6d +2x +2c+2d = 8d +2x +2c
