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l=27:3=9cm
p=27-9=18cm
L=9x18=162cm²
panjang = 2l
keliling = 54
keliling = 2(p+l)
54 = 2(2l+l)
54/2 = 2l+l
27 = 3l
1/3 x 27 = 1/3 x 3l
9 = l
luas = panjang x lebar
luas = 2l x l
luas = 2l²
luas = 2 x 9²
luas = 2 x 81
luas = 162 cm²