Bonsoir;

fig1

4,3* 4 => 17,2cm

fig2

2(2,5+7,8)  = 5+15,6 => 20,6cm

fig 3

on convertit tout en cm

8,4+6,7+ 6,7+  8,4+3,1 =>33,3cm

fig 4

2pir

2*4*pi = 8pi m

8*3,14 =>25,12m

fig5

r= 5,6*2 = 2,8

2* 2,8pi = 5,6pi dm

5,6*3,14 => 17,584 dm