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A good volume, the first volume of mathematics in the sixth grade of primary school, to find the shadow area
Two circular areas-square area = shaded area

3. 14×2×2×2-4×4

=25. 12- 16

=9. 12 (square centimeter)

The upper and lower semicircles form a whole circle, and the left and right semicircles form a whole circle, so that the shadow is repeated twice, and then the area of a square is subtracted. Just the area of the shadow.

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