The preimeter square of a circle with radius r centimetres would be
pi^2*r^4 centimetres squared.
By the way, in more than 35 years as a mathematician, I have not come across perimeter square! I would be interested to know the reason behind this question.
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The answer depends on the relationship between the square and the circle. For example, is the circle inscribed in the square or the square in the circle or something else?
The answer depends on their relative size: is the circle inside the square, the square inside the circle or something else?
The side of the square is equal to the diameter of the circle, in this case 2a so the perimeter is 8a cm.
Circle and square are two entirely different shapes. But the ratio of areas of square to circle if their perimeter is equal is pi/4.
one side of the square inscribed in a circle of radius r is sqrt2 * r (the square root of two times the radius) So the perimeter is 4 * sqrt2 * r