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?

The area of this road is 21.98 square meters

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1. 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
2. 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______ ．
3. 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)
4. A square and a circle have the same area, and the perimeter of the square must be longer than that of the circle reason?
5. The circumference of a circle is 12.56 decimeters. Draw the largest square in a garden. The square area is listed
6. The length of a cylindrical granary is 12.56 meters, so how many square meters does the granary cover?
7. The perimeter of a round flowerbed is 18.84 meters. How many square meters is the area of the flowerbed? One of the students in the above question is like this. (18.84 △ 2) × (18.84 △ 3.14 △ 2). Is he right? Please explain the reason
8. A round flower bed with a perimeter of 25 or 12 meters. How many square meters does this flower bed cover?
9. A 64cm long iron wire is cut into two sections, and each section is folded into a square. If the sum of the two squares is equal to 160cm2, the side lengths of the two squares are______ ．
10. A square solid iron block with a side length of 10 cm is placed in the center of the horizontal desktop with an area of 0.5 square meters Find the pressure and pressure of the iron block on the horizontal table
11. For a round pool, a 1-meter-wide path should be paved around it. How many square meters is the area of the path?
12. Build a 1-meter-wide circular road around a 94.2-meter-long circular pool. What is the area of this road
13. There is a circular fountain in the park, with a circumference of 31.4 meters. What is the area of the fountain?
14. 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
15. There is a circular fountain in the park, with a circumference of 31.4 meters. What is the area of the fountain?
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. If the circumference of a round lid is 56.52 cm, the area of the lid is______ Square centimeter
19. After cutting a circular piece of paper, put it together into an approximate rectangle with the width equal to the radius and the area unchanged. The perimeter of the rectangle is 16.56 cm. What is the area of the cut circular piece of paper in square cm?
20. The radius of a semicircle is 6cm. The area of the semicircle is (56.52) (I already know the area) square centimeter. What is the circumference? It is the circumference Expression