Răspuns :
L = 2l
2l • 2 + 2l = 54
4l + 2l = 54
6l = 54
l = 54 : 6
l = 9 ( latimea )
L = 2 • 9
L = 18 ( lungimea )
2l • 2 + 2l = 54
4l + 2l = 54
6l = 54
l = 54 : 6
l = 9 ( latimea )
L = 2 • 9
L = 18 ( lungimea )