bonjour
rectangle de gauche = 7 ( 3 + a ) = 7 a + 21
carré = a²
donc figure = a² + 7 a + 21
figure a
P = 2 ( 3 + p + 1.5) = 6 + 2 p + 3 = 2 p + 9
A = 3 ( p + 1.5) = 3 p + 4
figure c
P = x + d + c + d + c + d + x + 3 d = 3 x + 6 d + 2 c
A rectangle du haut = cd
A rectangle du bas = x ( 3 d) = 3 x d
Aire totale b = 3 x d + cd
figure b
partie rectangulaire = 2 y
partie semi circulaire = ( pi y² ) / 2
total = 2 y + ( pi y² ) / 2