It is given that ΔDEF $$sim$$ ΔGHI Also, length of DE = 16 cm and length of the corresponding side GH = 25 cm => Ratio of Area of ΔDEF : Area of ΔGHI = Ratio of square of corresponding sides = $$(DE)^2$$ : $$(GH)^2$$ = $$frac{(16)^2}{(25)^2} = frac{256}{625}$$ $$ herefore$$ The required ratio is 256 : 625 => Ans - (C)