Question 187747
The sides of the square are 5r and 5r.
That means that the area of the square is A= S^2
Solution
if s= 5r
then A= s^2 ==== A =(5r)^2 = (5)^2 x (r)^2 = 25r^2

The sides of the rectangle are 10r and 5r.
That means that the area of the square is A= LxW
Solution
if L= 10r
   W= 5r
then A= LxW ==== A =(10r)x (5r)  = 50r^2

hope it helps!!