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Tough to do this without a picture but here goes... Assuming the 4 semi-circles come right out of the corners of the square, they would be equal to two circles with diameters of 15cm apiece and radii of 7.5

The area of the square is 15 x 15 = 225 sq. cm

The area of the circles is 2 (pi x 56.25)

225 + 353.43 = 578.43 sq. cm

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Q: What is the area of a square with all sides of 15cm an 4 attached semicircles?
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