Jawabanmu

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2014-03-26T17:57:20+07:00
L = p - 4
k = 2 (p + l)
72 = 2 (p + p - 4)
36 = 2p - 4 
40 = 2p 
p = 20, l = 20 - 4 = 16

L = 20.16
L = 320

2 5 2
2014-03-26T17:59:41+07:00
72 = 2 x (p + p-4)
72 = 2p + 2p - 8
72 = 4p - 8
80 = 4p
p = 20
l = 16

L = 20 x 16 = 320