Răspuns :
675cm*2=1350cm
1350cm*2=2700cm
2700cm/5=540cm
540cm*8=4320cm
R=4320cm
1350cm*2=2700cm
2700cm/5=540cm
540cm*8=4320cm
R=4320cm
4a=perimetrul
4a-3*4a/8=4a-3a/2 = 8a-3a / 2 = 5a/2
2/4=1/2
5a/2-5a / 2*2 = 5a/2 -5a/4 = 10a-5a / 4 = 5a/4
5a/4 -5a / 4*2 = 10a-5a / 8 = 5a/8
5a/8=675 l:5
a=8*135 cm
P=4a = 4*8*135 = 32*135 = 4320 cm = 43,20 m.