bonjour,
1) P carré = c*4
P =24cm, côté = 24/4 = 6cm
A = 6² = 36cm²
2) P rectangle = 2(L+l)
x =l
2x = L
2(x+2x) = 24
2*3x =24
6x = 24
x = 4
l = 4cm
L = 8cm
A = 32cm²
3) P = 24cm, coté = 24/6 = 4cm
AB = 4cm
AM = 4cm
triangle, rectangle AHM :
MH² = AM²-AH²
=4²-2²
MH = √12≈3,5cm
A ABM =(AB*MH)/2 = (4*3,5)/2 = 7cm²
A hexagone = 7*6 = 42cm²
4) tu peux répondre,