l=16-p
L=½p*l
=½p(16-p)=½(16p-p²)
L'=½(16-2p)=0
2p=16
p=8
L=½*8(16-8)=32
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l=16-p
L=½p*l
=½p(16-p)=½(16p-p²)
L'=½(16-2p)=0
2p=16
p=8
L=½*8(16-8)=32