aider moi svp exercice 3

bonjour,

A AGEF = 5cm²
A d'un carré =c², côté AGEF = √5

1) P ABCD =
4(√5+1) = 4√5+4

2) A ABCD =
(√5+1)²=
5+2√5+1 =
2√5+6 =
2(√5+3)

3) A GDCBFE =
2√5+6-5 =
2√5+1