1)
P = 2,5*2 + 2 + 5*3 + 3/2 * 3,14 = 26,71 cm
2)
P = 3*5 + 5/2*3,14 = 22,85 cm
3)
P = 42 + 20*2 + 42-20 + 20/2*3,14 = 135,4 cm
4)
P = 9*2+6/2*3,14 = 27,42 cm