For a round pool with a circumference of 28.26 meters, a stone path with a width of 1 meter should be built around the pool, and the area of the path should be calculated
Inner radius 28.26 △ 3.14 △ 2 = 4.5m
Outer radius 4.5 + 1 = 5.5m
Area 3.14 × (5.5 × 5.5-4.5 × 4.5) = 3.14 × 10 = 31.4 square meters
RELATED INFORMATIONS
- 1. If the perimeter of a square is equal to that of a circle, the area ratio of the square to the circle is 1:1______ .
- 2. If the circumference of a circle is equal to that of a square, the area of the circle is larger than that of the square______ (judge right or wrong)
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- 11. There is a round pool in the park, with a circumference of 18.84 meters. A 1-meter-wide path is paved around the pool?
- 12. For a round pool, a 1-meter-wide path should be paved around it. How many square meters is the area of the path?
- 13. Build a 1-meter-wide circular road around a 94.2-meter-long circular pool. What is the area of this road
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- 15. There is a circular cistern on a piece of green space. Its perimeter is 31.4. How many square meters does it cover? The area of the circular cistern is 15% of the total area of this green space. What is the total area of this green space
- 16. There is a circular fountain in the park, with a circumference of 31.4 meters. What is the area of the fountain?
- 17. There is a circular fountain in the park, with a circumference of 31.4 meters. What is the area of the fountain?
- 18. There is a circular fountain in the park, with a circumference of 31.4 meters. What is the area of the fountain?
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