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The bottom of a triangle is enlarged twice, the height of the bottom is reduced twice, and the area remains unchanged
That's right
It can be obtained from the area formula
If the base of a triangle is reduced by 2 times, and the height remains unchanged, the area will be reduced by () times
The area is also reduced by two times
It is known that one side of a triangle is 17, one side is 21, and one side is 23
Helen formula
Q=（A+B+C)/2
S=√Q*（Q－A）＊（Q－B）＊（Q－C）
S = √ 29337.1875
RELATED INFORMATIONS
- 1. The height of a triangle is constant. Is the area proportional to the length of its base?
- 2. A parallelogram and a triangle have the same area and the same base length. Can you describe the relationship between a parallelogram and a triangle in one sentence?
- 3. The area of a triangular board is 3 and 8 / 7 square decimeters, which is 15 / 17 of that of a rectangular board
- 4. Calculation of land area Top length: 14.5m, bottom length: 15.5m, left length: 20m, right length: 18.2m, diagonal length: 25m What is the area of this land? How to calculate it?
- 5. How to calculate the land area
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- 8. What is the unit of measurement of xuanmi? It's not brown rice! It's Sheldon's 4.6 hm2 / femtosecond hair growth rate
- 9. Know, length, width how to calculate the mu? Do not know the formula
- 10. I want to ask. How to calculate the mu of land. Formula
- 11. One side of the triangle is 3cm longer than the second side, and this side is 4cm shorter than the third side. The perimeter of the triangle is 28cm. Find the length of the shortest side
- 12. The area of the triangle is 27 square centimeters. The length of the bottom is 45 centimeters. What's the height of the triangle?
- 13. The height of a triangle is 1.9 cm and the bottom is 4 cm. What is the area of a triangle?
- 14. A triangle site of 0.25 hectare, its bottom is 125 meters, its height is 125 meters______ Rice
- 15. A triangular wheat field is 180 meters long at the bottom and 130 meters high, with a total yield of 2340 kg. What is the yield per hectare of this wheat field?
- 16. A triangle wheat field is 125 meters long at the bottom and 160 meters high. A total of 2550 kg of wheat is harvested. What is the average yield per hectare
- 17. A trapezoidal wheat field, 17.4 meters, 4 meters, the area is 391 square meters, its bottom is how many meters? One more by the way The floor of a house is paved with square bricks. 270 square bricks with a side length of 0.4 meters are needed. How many square bricks do you need if you use square bricks with a side length of 0.3 meters instead? I'll finish the answer tomorrow, otherwise I won't give any points
- 18. Xiao Li's monthly food expenditure is 600 yuan. How much is Xiao Li's monthly total expenditure Support for the elderly 9%, other 10%, culture 20%, food 36%, shopping 2%, water and electricity 15%, health 8%
- 19. The bottom of a triangle is 6cm, and the height is 4cm. Enlarge the triangle by 2:1, and the area of the figure is several square centimeters
- 20. A parallelogram and a triangle have the same area and the same length at the bottom. If the height of the triangle is 6cm, the height of the parallelogram is () cm?