Răspuns :
P=90
l+l+L+L=90
2l+2L=90 /:2
l+L=45
L=2l
l+2l=45
3l=45
l=45:3
l=15
L=2*15
L=30
l+l+L+L=90
2l+2L=90 /:2
l+L=45
L=2l
l+2l=45
3l=45
l=45:3
l=15
L=2*15
L=30
L_______|________|
l________ =90m
90:3=30(m are l)
30X2=60(m are L)
Succes