If the area of the rectangle is 90 square kilometers, then what is the value of the missing side?
To find the missing side of the rectangle, we need to know the lengths of both sides.
Let the sides of the rectangle be x and y.
Given that the area of the rectangle is 90 square kilometers, we have:
x * y = 90
Since we know the area, we can use this information to find the missing side.
Since we don't have the specific values of the sides, we cannot determine the exact value of the missing side without more information.