bonsoir,
Gd demi cercle:
(2*pi *r)/2 => 3,14 * 3, 2 => 10,048 cm
Les 2 petits demi cercles: (1 cercle)
r = 1,6
2*pi r => 2*3,14 * 1,6 => 10,048cm
total:
10,048 = 10,048 =>20,096 => 20,1 cm
