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K = 54
2 ( p+l) = 54
2l + l = 27
3l = 27
l = 9
p = 2 . 9 = 18
L = p x l = 18 x 9 = 162 cm²
lebar=l
keliling persegi= 2(p+l) = 2(2l+l)=2(3l)=6l
6l=54
l=9 cm
p=2xl=2x9=18 cm
Luas= pxl=18x9=162 cm^2