Jawabanmu

2014-05-02T14:41:01+07:00
L = x <=> 9
p = 2x * krn 2 kali lebar <=> 18
K = 2 (p + l)
54 = 2 (x + 2x)
54 = 2. 3x
54 = 6x
9 = x

L = p. l
= 18 . 9
=162 cm²