Răspunsuri

2014-06-05T19:06:08+03:00
P= 2(L+l)
2(10+2l)= 36
20+2l=36
2l= 16
l= 8 cm
A= 8 la patrat= 64cm
2014-06-05T19:06:40+03:00
P=(L+l)*2
36=(10+l)*2
36=20+2l
2l=36-20=16
l=16:2=8
A=L*l=8*10=80cm2