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lebar = l
p = 2 x l
p = 2 l
keliling = 2 x ( p + l )
90 = 2 x ( 2 l + l )
90 = 2 x 3 l
90 = 6 l
l = 90 / 6
l = 15 cm
p = 2 l
p = 2 x 15
p = 30 cm
luas = p x l
luas = 30 x 15
luas = 450 cm²
jawaban nya : luas = 450 cm²