Show that of all the rectangles of given perimeter, the square has largest area.
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By the Isoperimetric theorem of rectangles, it can be proved that a square has the largest area when compared to a rectangle.
To calculate the area of a square, we need to calculate its perimeter.
The formula to calculate the area of a square is p/4, where p is the perimeter of the square.
To calculate the area 'a' of a rectangle, where the lengths and breadths always vary, we use the formula a+b = p/2 = 2a.
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