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lebar = x
y = 2x
x + y + x + y = 54cm
2x + x + 2x + x = 54 cm
6x = 54 cm
x = 9 cm
lebar = 9 cm
y = 2x
y = 2 x 9 cm
y = 18cm
panjang = 18 cm
l=lebar
p=2l
keliling persegi =54
2(p+l)=54
2(2l+l)=54
2(3l)=54
6l=54
l=54:6=9
p=2l~>p=2,9=18
jadi panjangnya 18 sedangkan lebar 9