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The sixth grade mathematics application problem (circle)
1. How long is the needle?

25 1.2/(2*3. 14)=40

What is the distance after one day and one night?

25 1.2 * 24/ 100 = 60.288m。

2. What is the cross-sectional diameter of this pine tree trunk? ( 1 1.304/3)/3. 14 = 1.2m

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