Answer: Area of rectangle is 50 square units.
Step-by-step explanation:
Since we have given that
Diagonal of the rectangle = 5√5
Let the width of rectangle be 'x'
Let the length of rectangle be '2x'
As we know the formula for diagonal of rectangle:

So, Length of rectangle be 2x=2×5=10 units
And the area of the rectangle is given by

Hence, area of rectangle is 50 square units.