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The sixth grade mathematics wisdom first volume answer? Who has it? mathmatics
1、C =πd = 3. 14 * 20 * 2 = 125.6

After 30 minutes, the distance traveled by the minute hand tip is: 125.6*30=3768 cm.

After 45 minutes, the distance traveled by the minute hand tip is: 125.6*45=5652 cm.

2. The side length of a square piece of paper is: 100/4 = 25cm.

The radius of this circle is: 25/2 =12.5cm.

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