Réponse :
bonjour,
Pcarré = 3 × 4
Pcarré = 12 cm
Acarré = 3 × 3
Acarré = 9 cm²
Pparallelogramme = 6 × 2 +5 × 2
P = 12 + 10
P = 22 m
Aparallelogramme = base × hauteur
A = 5× 4
A = 20 m²
Ptriangle = 40 + 42 + 26
P = 108 mm
Atriangle = (base × hauteur ) / 2
A = (24× 42) / 2
A = 1008/2
A = 504 mm²
voila:)
