The ratio of corresponding sides of similar triangles is 3:5; then find the ratio of their areas

When two triangles are similar, the ratio of areas of those triangles is equal to the ratio of the squares of their corresponding sides.
Given , the ratio of corresponding sides of the triangle is 3:5.
Ratio of their areas = 3²/5² [Theorem of areas of similar triangles]
= 9/25
Hence ratio of their areas = 9:25