Răspuns :
P drept=2(L+l)
l=L-2
1680=2(L+L-2)
1680=4L-4
1680+4=4L=>L=1684:4=>L=421 km =>L=421000 m
l=L-2
1680=2(L+L-2)
1680=4L-4
1680+4=4L=>L=1684:4=>L=421 km =>L=421000 m
L - lungimea, l- latimea
P =2x(L+l)
l=L-2
1680=2x(L+L-2) = 2x(2L-2) = 4xL-4
1680+4=4xL
L= 1684:4
L= 421 km
421 km = 421000 m
P =2x(L+l)
l=L-2
1680=2x(L+L-2) = 2x(2L-2) = 4xL-4
1680+4=4xL
L= 1684:4
L= 421 km
421 km = 421000 m