It is its square area which is found by pi*radius squared
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the amount of space inside a circle
½ the sum of the intercepted arcs.
it becomes a circle inside another circle
Measure the distance from top left corner of square (or top right) to the bottom right corner of square( or bottom left) to get the diameter of the circle. Then calculate the circumference from that figure.
The answer depends on their relative size: is the circle inside the square, the square inside the circle or something else?