![](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>)
The area of a trapezoid is 25 square decimeters, the upper bottom is 4.8 decimeters, and the height is 5 decimeters,
Area = (upper bottom + lower bottom) x height △ 2
25 = (4.8 + bottom) X5 △ 2
(4.8 + bottom) X5 = 50
4.8 + bottom = 10
Bottom = 5.2 decimeters
The area of a trapezoid is 200 square centimeters. The known height is 20 centimeters and the upper bottom is 60 centimeters. How much is the lower bottom
The title is wrong. It's 2000 square centimeters
The area of a trapezoid is 2000 square centimeters. The known height is 20 centimeters and the upper bottom is 60 centimeters. How much is the lower bottom
2000×2÷20-60
=200-60
=140 cm
A trapezoid has an area of 65 square decimeters and a height of 6.5 decimeters. Its bottom is 1.5 times that of its top, and its top is 6.5 decimeters______ The bottom is______ ．
The equation is: x + 1.5x = 20, & nbsp; 2.5x = 20, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; X = 8, 1.5x = 12, a: the upper bottom of the trapezoid is 8 decimeters, and the lower bottom is 12 decimeters. So the answer is: 8 decimeters, 12 decimeters
A trapezoid has an area of 65 square decimeters and a height of 6. Its bottom is 1.5 times that of the top, the top is () and the bottom is () ()
Median line 65 * 2 / 6.5 = 20
Top and bottom 20 / (1 + 1.5) = 8
Bottom 8 * 1.5 = 12
The area of a trapezoid is 66 square decimeters, the bottom is 14 decimeters, and the height is 6 decimeters. How many decimeters is the top of the trapezoid?
Trapezoid area = (upper bottom + lower bottom) × height △ 2
Then the upper bottom = trapezoidal area × 2 △ height - lower bottom = 66 × 2 △ 6-14 = 8 (decimeter)
It is known that the area of a trapezoid is 18 square decimeters, and its upper bottom is 4. Lower bottom is 7. How many decimeters is its height? (solution of equation)
（4.5+7.5）×X÷2=18
6X=18
X = 3 decimeters
If the area and height of a parallelogram and a trapezoid are equal, then the sum of the top and bottom of the trapezoid is () of the bottom of the parallelogram
If the area and height of a parallelogram and a trapezoid are equal, then the sum of the top and bottom of the trapezoid is twice that of the bottom of the parallelogram
A classroom is 9 meters long, 7 meters wide and 3.5 meters high. How many square meters are the four walls to be painted (except the area of doors, windows and blackboard is 24.5 square meters)
The wall 9 * 3.5 * 2 + 7 * 3.5 * 2-24.5 = 87.5 square meters; the top 9 * 7 = 63 square meters. The floor can't be painted, so it's not included. The total area to be painted is 150.5 square meters
The classroom is 8.5 meters long, 6 meters wide and 4.2 meters high, with a total area of 35.8 meters for doors, windows and blackboard,
How many square meters is the painting area
(8.5×4.2+6×4.2)×2+6×8.5-35.8
=121.8+51-35.8
=137
The painting area is 137 square meters
A large auditorium is 24m long, 15m wide and 8m high. The ceiling and surrounding walls of the auditorium should be painted. The area of the doors and windows is 100 square meters, and the average paint is 0.4KG per square meter. How many kg of paint are needed? Yes.)
Exactly like one's talent
RELATED INFORMATIONS
- 1. An auditorium is 15 meters long, 9 meters wide and 2 meters wide. The total area of doors and windows is 43.6 square meters. The top and surrounding walls of the auditorium should be painted What's the area of the building?
- 2. The diameter of a circle is 6 decimeters. If its diameter increases by 4 decimeters, its perimeter increases by () decimeters, and its area increases by () square decimeters
- 3. A square sheet iron with side length of 6 decimeters is processed into the largest circle. The circumference of the circle is () and the area is ()
- 4. A semicircular flowerbed is 10.28 meters in circumference. How many square meters is the area of this flowerbed?
- 5. The perimeter of a rectangular board is 80 decimeters, and the ratio of width to length is 3:5. Saw the largest round table on the board. What is the area of the round table Decimeter?
- 6. It is known that the circumference of the semicircle is 51.4cm. How many centimeters is the diameter and how many square centimeters is the area of the semicircle
- 7. What is the area of a semicircle with a circumference of 10.28 cm
- 8. Xiaoming uses a 15.42 decimeter iron wire to form a semicircle, the radius of which is______ Decimeter, area is______ Square decimeter
- 9. There is a semicircular flower bed, its perimeter is 102.8 cm, area?
- 10. When a circle is enlarged, its area is eight times larger and its circumference is 50.24 cm larger than before. What is the original area of the circle? It's better not to use the equation. It can't be used,
- 11. Finding the area by knowing the circumference of a rectangle A rope is 31.4 meters long. Is it a rectangle or a square, or a circle? (please calculate the relevant data) The key is the area of the rectangle. I know everything else. I also know that the circle is big, 3Q
- 12. It is known that the width of a rectangle is half of its length, and its circumference is 3.6 meters. How many meters is the width and area of this rectangle? Write out the calculation steps
- 13. The circumference of a rectangle is 56 cm, and its width is known to be 12 cm. Its area is______ ．
- 14. As shown in the figure, ∠ C = 90 ° in △ ABC, AE bisects ∠ BAC, BD ⊥ AE intersects AE extension line at point D. if ∠ EBD = 24 °, what is ∠ EAB equal to A.12 B.24 C.33 D.66
- 15. The area of the overlapping part of the two figures is equivalent to 2 / 13 of the area of the large rectangle and 3 / 10 of the area of the small rectangle 1: The area ratio of large rectangle to small rectangle is (:) 2: If the area of the overlap is 18 square centimeters, the total area covered by the two rectangles is () square centimeters
- 16. The overlapped part of a graph accounts for 18% of the area of the large circle and 15% of the area of the small circle. (1) if the area of the large circle is known to be 25 square decimeters, calculate the area of the small circle. (2) if the area of the overlapped part is 25 square centimeters, then what is the total area of the graph?
- 17. How to draw three figures with an area of 10 square centimeters?
- 18. The bottom of a triangle increases by 1 / 10, the height decreases by 1 / 10, and the area decreases by several parts
- 19. The circumference of an isosceles triangle is 16 cm, and the height at the bottom is 4 Li wood. Find the length of each side of the triangle`
- 20. The side length of the square is 10 cm. The area of triangle a is 20 cm less than that of triangle B. find the length of line ab