It is given that ΔABC $$sim$$ ΔPQR Also, length of AB = 18 cm and length of the corresponding side PQ = 12 cm Let area of ΔPQR = $$x$$ sq cm => Ratio of Area of ΔABC : Area of ΔPQR = Ratio of square of corresponding sides = $$(AB)^2$$ : $$(PQ)^2$$ => $$frac{324}{x} = frac{(18)^2}{(12)^2}$$ => $$x = (12)^2 = 144$$ sq cm => Ans - (B)