If the ratio of the areas of two similar triangles is 4:9, what is the ratio of their perimeters?

✓ Correct Answer: Option A

For similar triangles, the ratio of areas is the square of the ratio of corresponding sides or perimeters. If Area1/Area2 = (P1/P2)², then P1/P2 = √(Area1/Area2) = √(4/9) = 2/3.