If the circle touches each edge of the square then its diameter is the same as the side of the square and its circumference is pi times the diameter.
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A circle with radius 15mm will fit in a 30mm square. Find the intersection of the square's diagonals, that is the center of the circle.
The same as half the side of the square, as the radius of the circle is half its diameter, and the diameter of the circle is equal to the side of the square.
A circle is not a number, it is a 2-dimensional shape. A number can have a square root, not a shape. So, a circle cannot have a square root!.
Half the square root of the square radius equals the circle radius.
Area of a circle = pi*radius2 The radius of the circle will be 1/2 the size of the length of a side of the square.