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40 = 2(p+p-3)
40 = 2(2p-3)
40 = 4p-6
4p = 40+6
4p = 46
p = 46/4
p=11,5
l=p-3
=11,5-3
=8,5
L=pXl
=11,5X8,5
= 97,75
Maaf, kalau salah.