Jawabanmu

2014-05-12T21:36:38+07:00
Diket s = 3/2 l
p = 13
K = 42

K = 2p + 2l
42 = 2 . 13 + 2l
42 = 26 + 2l
42 - 26 = 2l
16 = 2l
16/2 = l
8 = l
 
s = 3/2 l
s = 3/2 x 8
s = 12 cm
K persegi = 4 s
K = 4 x 12
K = 48 cm