Jawabanmu

2014-06-03T18:54:57+07:00
2 ( p + l ) = 40
2 ( 12 + l ) = 40
12 + l = 40 : 2
l = 20 - 12 = 8

luas = p * l
= 12 * 8 = 96
Jawaban paling cerdas!
2014-06-03T18:57:00+07:00
K = 2 . (p+l)
40 = 2 . ( 12 + x )
40 = 24 + 2x
40 -24 = 2x
16 = 2 x
8 = x

L = p . l
L = 12.8
L = 96
thanks Aliviakhofifah :)
sama-sama, jadiin jawaban terbaik dong, please!
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