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panjang = 2x
keliling = 2(p+l)
54 = 2(2x+x)
54 = 2(3x)
54 = 6x
x = 54 : 6
x = 9
p = 2x = 2 x 9 = 18 cm
l = x = 9 cm
luas = p x l
luas = 18 cm x 9 cm
luas = 162 cm²
54=2x(2x+x)
27= 3x
9=x
L=pxl
= (2x) x (x)
=(2x9) x 9
=18x9
=162