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The answer to the second question of 68 faces in the new synchronous exercise of mathematics in the first volume of the fifth grade.
Square s of circular pool = 3.14 *10 (can't hit the second child) = 3.14 *100 = 314 (square meter).

Zhongtang: S=6 divided by the square of 2=3 3 *3. 14=28.26 (square meter).

Water area: 3 14-28.26=285.74 m2.

I came up with this myself. I hope it helps you, because I haven't learned it yet (I will soon learn it). That's what it means anyway. I wonder if the formula is correct. You can correct it yourself, or you can ask me if it is helpful to your study. Thank you for your adoption!

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