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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?
Bottom area: 3.14 * (3 / 2) ^ 2 = 7.065 square meters
Total filling: 7.065 * 0.5 * 2 = 7.065m3 = 7.065m3
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A piece of iron wire can just form a square with a side length of 6 cm. Now, the iron wire is surrounded into a square with a length of 8 cm
The area of a square is 6x6 = 36 square centimeters
The square is enclosed into a rectangle 8 cm long
The area of a rectangle = the area of a square = 36 square centimeters
The area of a rectangle is length x width
Ψ 36 △ 8 = 4.5cm
A: the width of a rectangle is 4.5cm
Liangliang uses a 1.5-1 m long iron wire to form a triangle. One side of the triangle is 5 / 2 m, the other side is 40 cm
Liangliang uses a 1.5m long wire to form a triangle. One side of the triangle is 2m, the other side is 40cm. How long is the third side? What triangle is it?
Liangliang uses a 1.5-1 m long iron wire to form a triangle. One side of the triangle is 5 / 2 m, the other side is 40 cm
1 and 5 / 1m-5 / 2m-40cm
=1.2-0.4-0.4
=0.4m
Liangliang uses a 1.5m long wire to form a triangle. It is measured that one side of the triangle is 5m long and the other side is 40cm long. How long is the third side? What kind of triangle is it?
1 and 5 / 1m-5 / 2m-40cm
=1.2-0.4-0.4
=0.4m
This is an equilateral triangle
To adopt the first correct answer is to respect the labor of the respondents. I wish you progress!
Li Ming enclosed a triangle with a one meter long wire. One side of the triangle was one fifth of a meter, and the other side was two fifths of a meter
How long is the third side? What triangle is it
Third side = 1-1 / 5-2 / 5 = 2 / 5m
It's an isosceles triangle
For a piece of iron wire, one meter less than half of it is used for the first time, and one meter more than half of it is used for the second time. As a result, three meters are left?
Suppose the original x meter, then x - (x2-1) - [12 (x2 + 1) + 1] = 3, the solution is: x = 14
2.8 mu, how long is it? How wide is it?
Question supplement: the length of the land area is 60 meters. The width is 1.5 meters. How many Mu is it? 60x1.5 = 90 square meters, 90 / 666.667 = 0.135 mu, 1 minute more than 60x1.5
The length is 100 meters, the width is 50 meters, and the field is 7.5 mu. It should be divided into eight fields. How can I find out?
8 farmland = 0.8 Mu = 0.8 * (100 * 50 / 7.5) = 533.3333 (M2)
533.3333/50 = 10.6667 (m)
Cut a rectangle with length of 10.6667 meters and width of 50 meters, and its area is 8 minutes
Describe in English: computer, stool, bed, lamp, door
My desk is big and new
My computer works fast.
The chair in my room is too small.
My bed is very soft.
The colour of my lamp is red.
The door in my class room is wooden.
It costs 968 yuan to buy a chair and a bed. A chair is 1 / 10 of a bed. How much is a bed after the price reduction? All the goods in a shopping mall
It costs 968 yuan to buy a chair and a bed. A chair is 1 / 10 of a bed. How much is a bed after price reduction? 20% discount for all goods in a shopping mall
X Yuan for chair and 10x yuan for bed
It is known that x + 10x = 968
x=88
The final result is 88 * 0.8 = 70.4
There are 12 chairs on the roadside of the community from the beginning to the end. Every two chairs are 2 meters apart. How long is the path?
A total of 12 chairs are placed from the starting point to the end point. From this, we can find that the interval number is 12-1 = 11, the interval between each two chairs is 2 meters, and the length of this path is 11 × 2 = 22 (meters)
A: the path is 22 meters long
RELATED INFORMATIONS
- 1. 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?
- 2. 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?
- 3. 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
- 4. 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?
- 5. 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
- 6. 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
- 7. 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
- 8. 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!
- 9. It is known that one right side of a right triangle is 6, and the corresponding angle of this right side is 18 degrees. Find the length of another right side and hypotenuse The right angle side and the hypotenuse take the smallest value
- 10. If there is a right triangle green space, the length of two right angles is 6 m and 8 m respectively. Now we need to expand the green space into an isosceles triangle, and the expansion part is a right triangle with 8 m as the right angle side. Find the perimeter of the expanded isosceles triangle green space. (Fig. 2, Fig. 3 for standby)
- 11. 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?
- 12. 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?
- 13. 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?
- 14. The area of a square flower bed is 225 square meters. How many meters is its side length?
- 15. 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
- 16. 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?
- 17. In a round flower bed, half a circle, 141.3m, the radius of this flower bed is
- 18. 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
- 19. 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?
- 20. 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?