Tell the parallelogram area how to find the bottom and height

Because the area of the parallelogram = high * bottom, so bottom = area / height of the parallelogram, area / height = bottom divided by height equals to bottom ~ bottom = area / height, area / height of the parallelogram

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1. In order to keep the area of the parallelogram unchanged and increase the height to 4 times of the original, the bottom should be ()
2. Parallelogram has a certain area, its bottom and height______ (whether in inverse proportion) reason:______ ．
3. The base and height of the parallelogram increase by 1 / 3, and the area of the parallelogram increases by several parts
4. The two bases of a parallelogram are 6 decimeters and 4 decimeters in length respectively. One of the parallelogram is 5 decimeters high and the area of the parallelogram is 5 decimeters How many square decimeters? To calculate formula, method
5. If the length of the hypotenuse of an isosceles triangle is a, then its area is?
6. The bottom is 12.56cm, the height is 8cm triangle area ..
7. In the triangle ABC, D and E are the midpoint of BC and AC respectively, ad and be intersect at O. given that the area of triangle ABC is 1, calculate the area of triangle BOD
8. The area of a parallelogram is 64 square decimeters, and the area of a triangle with the same base and height is 64 square decimeters______ Square decimeter
9. 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
10. 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
11. The volume of a cone is certain. The area of the bottom of a cone is not proportional to its height. Why? The length of the road is fixed every day. The length of the road is not proportional to the number of days. Why? Come back!
12. If the volume of a cone is constant, the area of its bottom is inversely proportional to its height______ ．
13. If the volume of a cone is constant, the area of its bottom is inversely proportional to its height______ ．
14. The volume of the cone is 36 cm, the bottom area is 18 cm, and the height is?
15. If the volume of a cone is constant, is the area of its bottom proportional to its height? What is the proportion?
16. The base area of the cone is fixed, and the volume and height of the cone are in direct proportion______ (judge right or wrong)
17. The volume of a cone is fixed, and its bottom area and height are in direct proportion? And explain the reason Because
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19. Judge whether the two quantities in the following questions are in inverse proportion, and explain the reason: the triangle has a certain area, its bottom and height
20. The bottom of a triangle is 10 cm. Is its area proportional to its height? Why?