Of all rectangles of perimeter {{MATH_9}}, which side lengths give the greatest area? {{CMD_10}} The picture below depicts four rectangles of perimeter {{MATH_11}}. There are infinitely many rectangles with this property, and among all of them we have to find the one with the maximum area. With the help from calculus, we can easily solve this problem. {{CMD_12}} {{ENV_13}} {{CMD_14}}