Perimeter of two similar triangles ?ABC and ?PQR are 35 cm and 45 cm respectively,then find the ratio of areas of the two similar triangles.

Remember the theorem that for similar triangle Ratio of corresponding sides = ratio of their perimeter and ratio of their areas = square of the ratio of their sides So Ratio of areas of similar triangle =Ratio of square of their perimeters =(35/45)^2 ie 49/81