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- What is the shadow area of the sixth grade mathematics circle?
What is the shadow area of the sixth grade mathematics circle?
As shown in the figure, it is easy to find that the areas of a.b.c.d are equal.
So shadow area = 1/4 circle area-triangle area.
= 1/4
*
Pi?
*2
*2
- 1/2
*
2
*2
=π-2
= 1. 14
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