Junior one math problem: A square with a side length of A has four shapes, such as petals or leaves. These four petals/leaves are represented by an algebraic expression containing a.

Solution:

The area of this four-leaf petal is equal to the area of four semicircles minus the area of the square.

Namely: S=2π(a/2)? -a？

Can you get S=(π-2)a after you finish it? /2

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