![](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>)
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?
The radius of the flower bed is 31.4 △ 2 △ 3.14 = 5m
The area is 3.14x5 △ 2 = 39.25 square meters
A flower bed is surrounded by a wall. The fence around the flower bed is 46 meters long. How about the area of the flower bed? It's a trapezoid and 20 meters high
You are not quite the right conditions, ah, see you give the conditions can not make the answer
Is it an isosceles trapezoid, or a right angle trapezoid, or what else
The diameter of a round flower bed is 42 meters. Along its sideline, a rose is planted every 3 meters. How many roses should be planted?
14 × 42 △ 3 = 131.88 △ 3 ≈ 43 (trees) a: about 43 trees
Around a circular flower bed, a rose was planted every 2 meters. A total of 72 roses were planted. How many meters is there in a circle of this flower bed?
Perimeter (72 + 1) * 2 = 146m
A wire can just form a cuboid frame of 15m long, 7m wide and 6m high
So, how many meters is the edge length of this cube
Wire length = 4 × (15 + 7 + 6) = 112m
Cube edge length = 112 △ 12 = 28 / 3M
An isosceles triangle is formed by a piece of iron wire with a vertex angle of 60 degrees. The waist length of this triangle is 8 cm. What is the area of a square surrounded by this iron wire?
An isosceles triangle is formed with a piece of iron wire, and the vertex angle is 60 degrees. Xiaoming, the waist length of the triangle is 8 cm. If the iron wire is used to form a square, what is the area of the square?
An isosceles triangle with a vertex angle of 60 ° can be judged as an equilateral triangle. The length of the wire is 8x3 = 24cm, and e uses it to form a square. The continuous length of the square is 24g4 = 6cm, and the area of the square is 6x6 = 36cm2
A 12 cm long and 8 cm wide rectangular wire frame is re enclosed into a square: (1) how long is the wire? (2) What is the side length of a square?
① (12 + 8) × 2 = 20 × 2 = 40 (CM) a: the length of the wire is 40 cm. ② 40 △ 4 = 10 (CM) a: the side length of the square is 10 cm
Use a piece of iron wire to form a square with a side length of 8cm. If you draw it into a parallelogram, the area will be reduced by 12cm2. What is the height of the parallelogram______ cm．
(8 × 8-12) △ 8, = (64-12) △ 8, = 52 △ 8, = 6.5 (CM). Answer: the height of the parallelogram is 6.5 cm. So the answer is: 6.5
Use a piece of iron wire to form a square with a side length of 8cm. If you draw it into a parallelogram, the area will be reduced by 12cm2. What is the height of the parallelogram______ cm．
(8 × 8-12) △ 8, = (64-12) △ 8, = 52 △ 8, = 6.5 (CM). Answer: the height of the parallelogram is 6.5 cm. So the answer is: 6.5
Use a piece of iron wire to encircle a square with a side length of 8 cm. If you draw it into a parallelogram, the area will be reduced by 8 square cm and the parallelogram will be drawn
The height is () cm
What is the area of a square
8 × 8 = 64 (cm2)
What is the area of a parallelogram
64-8 = 56 (cm2)
What is the height of a parallelogram
56 △ 8 = 7 (CM)
RELATED INFORMATIONS
- 1. 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?
- 2. 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?
- 3. 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?
- 4. 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
- 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 6 meters, and the pool depth is 1.2 meters. How many square meters is the area inlaid with ceramic tiles?
- 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 8 meters, and the pool depth is 2 meters. How many square meters is the area inlaid with ceramic tiles at most
- 7. 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
- 8. 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
- 9. 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!
- 10. 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
- 11. 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?
- 12. 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?
- 13. The area of a square flower bed is 225 square meters. How many meters is its side length?
- 14. 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
- 15. 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?
- 16. In a round flower bed, half a circle, 141.3m, the radius of this flower bed is
- 17. 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
- 18. 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?
- 19. 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?
- 20. 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