The Area of shaded region in a circle

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I'm having trouble solving this problem.

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I can't solve this. I don't know where and how to start.

I don't know there is any formula for finding the area for this kind of shape, and if it did, I still can't use it since I all I know is radius of 10cm

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Draw line segments from the two intersections to each circle's center; these four line segments form a square. Also draw a line between the two intersection points, dividing the overlap into two wedges and the square into two triangles.

Notice that each wedge is what's left after you take a triangle away from a quarter-circle, and the area of that wedge can be determined accordingly.