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| 1. | Tell us which problems with the perimeter of a circle you can solve in your daily life. |
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| 2. | to south and 2.8 kilometres east to west, covering in total an area of about six square kilometres, with |
| 现在的西湖，南北长3.3千米，东西宽2.8千米，环湖一周约15千米，连湖中的洲岛，面积约6平方千米。 |
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| 3. | A flat hardwood disk with a grooved perimeter, pierced by three holes through which the lanyards are |
| 三眼木盘带有一个圆边槽的硬木盘，通过船上系物的短绳穿三个洞，用来系紧左右支桅索 |
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