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2014-06-01T21:00:02+03:00
L=2l
2l.l=128
2l²=128
l²=64
l=8
iar L=2.8=16
P=2(L+l)=2.24=48 cm

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2014-06-01T21:00:08+03:00
L=2l

A=L*l
A=128

A=2l*l=128

2l²=128
l²=64   ⇒l=8

L=8*2=16

P=2l+2L=2*8+2*16= 16+32= 48
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