Answer:
The scale factor of their side lengths is 4:7.
Step-by-step explanation:
Let the side length of two squares are p and q.
The area of a square is

Using this formula, we get the area of both squares.


It is given that the areas of two similar squares are 16m and 49m.


Taking square root both the sides.


Therefore the scale factor of their side lengths is 4:7.