![](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 72 71" width="72"></svg>)
A circular pool with a radius of 6 meters is surrounded by a circular path with a width of 1 meter. How many square meters is the area of this path?
6 + 1 = 7 (meters), so the area of the path is: 3.14 × (72-62), = 3.14 × (49-36), = 3.14 × 13, = 40.82 (square meters). A: the area of the path is 40.82 square meters
The diameter of a round flower garden is 20 meters. Now we need to build a 1 meter wide cement road around the flower garden. How many square meters does this road cover?
20 △ 2 = 10 (meters) 10 + 1 = 11 (meters) 3.14 × (112-102) = 3.14 × (121-100) = 3.14 × 21 = 65.94 (square meters) a: the area of cement road is 65.94 square meters
A semicircular flowerbed covers an area of 25.12 square meters. It is necessary to surround the flowerbed with a fence. How long is the fence?
What is the floor area of a round flower bed with a radius of 10 meters? How many meters is the fence around it?
It covers an area of 10 * 10 * 3.14 = 314 square meters
The length of the fence is a circle, and the perimeter is 3.14 * 10 * 2 = 62.8 meters
Divide the 7m long wire into 9 parts on average, each section is 7m long (), each section is () m long, and 5 sections are full length ()
There is another problem
If a / B, the numerator plus 5a, in order to keep the size of the fraction unchanged, the denominator should be added ()
1/9
7/9
5/9
How many meters is the length of each section? How many parts of the total length of each section?
7 △ 3 = 7 / 3 meter
1 △ 7 = 1 / 7
Answer: each section is 7 / 3 meters long
Each segment is one seventh of the total length
Divide the 6 / 7 meter long wire into 6 sections, each section is () of the length of the wire, and each section is ()
Each section of iron wire accounts for 1 / 6 of the total length
Length of each section: 6 / 7 △ 6 = 1 / 7M
A 15.7m long iron wire is used to encircle the city with a square and a circle respectively. The () shape has a large area of () square meters
If we surround
A wire is 1.2 meters long and folded into an equilateral triangle. Its height on any side is about 0.34 meters. Its area is ()
Side length: 1.2 / 3 = 0.4m
Area = (1 / 2) * side length * height
=0.4*0.34/2
=068 square meters
Formula: (1.2 / 3) * 0.34/2 = 0.068 M2
The iron wire is 1.2 meters long and folded into an equilateral triangle. Its height on one side is 3.4 decimeters. The area of this triangle is square decimeters
1.2 / 3 * 10 * 3.4 / 2 = 6.8 decimeters & sup2; one iron wire is 1.2 meters long, folded into an equilateral triangle, its height on one side is 3.4 decimeters, and the area of this triangle is 6.8 square decimeters
RELATED INFORMATIONS
- 1. Guangming primary school built a semicircular flower bed along a wall. The fence around the flower bed is 31.4 meters long. How many square meters does the flower bed cover?
- 2. The school has built two cylindrical flower beds. The inner diameter of the flower beds is 3 meters, and the height is 0.8 meters. If the height of the filling soil is 0.5 meters, How many cubic meters of soil are needed for the two flower beds?
- 3. Street Park to build a diameter of 12 meters of circular flower bed, around with tiles paved a 3 meter wide path, each tile area is 0.9 square meters Street Park to build a diameter of 12 meters of circular flower bed, around with tiles paved a 3 meter wide path, the area of each tile is 0.9 square meters, how many tiles to use to lay this path?
- 4. There is a flower bed 25 meters long and 20 meters wide. If a 3 meter wide path is built around the flower bed (as shown in the figure), what is the area of the path?
- 5. It is known that the length of rectangular ABCD is 30cm and the width is 20cm. A proper plane rectangular coordinate system is established, and the coordinates of a, B, C and D are obtained first Then the rectangle is made in the rectangular coordinate system ABCD.Thank you
- 6. For a cylindrical pool, the inner wall and bottom of the pool should be inlaid with ceramic tiles. The diameter of the pool bottom is 6 meters, and the pool depth is 1.2 meters. How many square meters is the area inlaid with ceramic tiles?
- 7. For a cylindrical pool, the inner wall and bottom of the pool should be inlaid with ceramic tiles. The diameter of the pool bottom is 8 meters, and the pool depth is 2 meters. How many square meters is the area inlaid with ceramic tiles at most
- 8. As shown in the figure, in the quadrilateral BCDE, angle c = angle, bed = 90 degree, angle B = 60 degree, extend CD, be, get the right triangle ABC The length of BC
- 9. As shown in the figure, in the rectangular coordinate system a (0,1) B (2.0) C (2,1.5) (1) find the area of △ ABC. (2) if there is a point P (a, 1 / 2) in the second quadrant Using the formula containing a to express the area of a quadrilateral abop (3) Under the condition of (2), is there a point P such that the area of the quadrilateral abop is equal to the area of △ ABC? If so, find out the coordinates of point P. if not, explain the reason
- 10. It is known that one right side of a right triangle is 3 meters, and the corresponding angle of this right side is 18 degrees. Find the length of another right side and hypotenuse Is a right triangle, and the right side of the three meters is vertical, that is, how much is the length of a, B and C!
- 11. After adding 3cm to the two adjacent sides of a square, we get a new square. The area of the new square is 39 square centimeters larger than that of the original square. What's the area of the original square?
- 12. The area of a square flower bed is 225 square meters. How many meters is its side length?
- 13. When the side length of a square increases by 3cm, its area increases by 39cm2. The side length of the square is () A. 5cmB. 6cmC. 8cmD. 10cm
- 14. In the middle of a circular grassland with a girth of 25.12 meters and a flower bed with a radius of 2.5 meters, how many square meters of grassland are left?
- 15. In a round flower bed, half a circle, 141.3m, the radius of this flower bed is
- 16. The diameter of a round flower bed is 8m. How many meters is the perimeter of the flower bed and how many square meters does it cover
- 17. There is a round flower bed in the park, with a diameter of 30 meters. Grandfather Zhang ran around the flower bed for 5 laps in morning exercise. How many meters did he run this time?
- 18. As shown in the picture, a square street garden, the middle is a square flower bed, surrounded by a path, the side length of the flower bed is 12 meters, the width of the path is 1 meter What's the area of the hotel?
- 19. A square flower bed should be built in the park, and a 2m wide lawn should be laid beside the flower bed. The lawn area is 96 square meters. What is the total area of the flower bed and lawn? In the simplest way. No equations
- 20. As shown in the picture, the shape of a 40 meter long vegetable greenhouse is a semi cylindrical shape with a 3-meter-high semi-circular brick wall at both ends. The vegetable greenhouse is covered with plastic film until the end How many square meters less plastic film is needed? How many cubic meters of space is the whole vegetable greenhouse?