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The area application problem in the third grade of primary school is accompanied by the answer.
On the edge of a circular garden with a circumference of 62.8 meters, a circular road with a width of 1 meter was built. What is the area of this path?

The outer circumference of the annular iron sheet is 25. 12cm and the inner diameter is 5cm. Find the area of annular iron sheet.

The radius of the outer circle of the annular Yu Pei is 2cm, which is1.5cm more than the radius of the inner circle. What is the area of this circular Yu Pei?

How many square meters does a semicircular stadium with a length of 1 10 meter and a width of 90 meters at both ends need for an apprenticeship area to open six circular runways with a width of 0.85 meters?

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