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The clock in the library
4:00-2:00=2 hours

The hour hand has reached 60?

Disappear:

3. 14× 10×2×60? ÷360?

≈ 10.47 cm

Scanning area:

3. 14× 10? ×60? ÷360?

About 52.33 square centimeters

Keep two decimal places

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