Răspuns :
P = 2L + 2l
L = 4l
P = 2x4l + 2l
90 = 10 l
l = 90 : 10
l = 9
L = 4x9 =36
verificare : 2x36 + 2x9 = 72 + 18 = 90
succes!
L = 4l
P = 2x4l + 2l
90 = 10 l
l = 90 : 10
l = 9
L = 4x9 =36
verificare : 2x36 + 2x9 = 72 + 18 = 90
succes!