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There is a shadow area under primary school mathematics (please don't delete it by the administrator)
S shadow = semicircle area-triangle area = 0.5 * 3.1416 * 25-0.5 * 5 =1.07 * 25 = 26.75.

S shadow = half the area of the great circle-the area of the small circle = 0.5 * 3.1416 * 6-3.1416 * 3 = 28.27.

S shadow = square area-circular area = 2 * 2-3.1416 *1*1= 0.0.8546438+0.

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