bonsoir
20 x 16 = 320
aire partie rectangulaire = 320 m²
( 16 x 8 ) / 2 = 64
aire partie triangulaire = 64 m²
(3.14 x 6²) / 2 = 56.52
aire demi disque = 56.52 m²
total = 320 + 64 + 56.52 = 440 .52 m²
P = 20 + 18 + 8 + 20 + 2 + 2 + 2 x 3.14 x 6 = 70 + 37.68 = 107.68 m