bonjour
AB = 18 m
BC = 13.5 m
Cd = 10 m donc EF = 18 - 10 = 8
AF = 13.5 - 7.5 = 6
P = 18 + 13.5 + 10 + 7.5 + 8 + 6 = 63 m
= 6300 cm