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The area of a parallelogram is 48 square meters. The bottom of a triangle is equal to its height, which is twice as high. The area of this triangle is () square meters
It's 48 square meters
Because the area of a triangle is equal to 1 / 2 × bottom × height
The area of a parallelogram is equal to the base x the height
The bottom of a triangle is 12 meters long. If the bottom is extended by 1 meter, the area will be increased by 4 square meters. How many square meters is the area of the original triangle?
12×（4×2÷1）÷2
=12×8÷2
=48 square meters
A triangle flag, it is a right triangle, the length of the three sides are 8 / 5 decimeter, 5 / 4 decimeter, 25 / 18 decimeter
What's the area of this flag in square decimeters?
The smaller two are right angles
So area = 1 / 2x8 / 5X25 / 18 = 9 / 40
A piece of cloth is 18.1 meters long and 1.6 meters wide. Use this cloth to cut two right triangle flags with right angle sides of 4 decimeters and 3 decimeters respectively. You can cut out at most______ Noodles
181÷3=60… 1, 16 △ 4 = 4, 60 × 4 × 2 = 480, so the answer is: 480
Use red paper to make right triangle flags. The right angle sides of the flags are 4 decimeters and 3 decimeters respectively. How many square decimeters of red paper is needed to make 15 such flags?
I hope it's in this format By /…… Except for
3 × 4 × 15 = 180 square decimeters
How many flags can you cut from a 60 decimeter long and 46 decimeter wide rectangular colored paper into a right triangle flag with a bottom and a height of 5 decimeters?
At most, it can cut such small flags = 2 × (60 △ 5) × [(46-1) △ 5)] = 216
A piece of red cloth is 30 meters long and 1.5 meters wide. How many right triangle flags can you make with it? How about the area of the flag
30*1.5=45㎡
45 * 100 = 4500 square decimeters
5 * 5 = 25 square decimeters
4500 / 25 = 180
The area of a triangle is 3 square meters, the height is unchanged, the bottom is expanded by 3 times, and the area of the triangle is ()
The area of the triangle is (9) square meters
B. C. D are all on the same line, △ ABC and △ CDE are equilateral triangles, ad and be intersect at point O, find the degree of ∠ BOD
120° ,∠BOD=180-∠OBD-∠ODB
=It is shown that ∠ oba + bad = 60 - ∠ OBD + ∠ bad, so ∠ bad + ∠ ODB + 120
In the same way, we can see that 120 = ∠ deo + ∠ ODB, so ∠ deo + ∠ ODB = ∠ bad ∠ ODB introduces ∠ deo = ∠ bad,
Therefore, the two triangles are congruent triangles, so ∠ BOD = 120 degree
As shown in the figure, given that points B, C and D are on the same straight line, △ ABC and △ CDE are equilateral triangles, be intersects AC at F, ad intersects CE at h, verification: FH ‖ BD
It is proved that: (1) both ∵ ABC and ∵ CDE are equilateral triangles, ∵ BC = AC, CE = CD, ∵ BCA = ∵ ECD = 60 °, ∵ BCA + ∵ ace = ∵ ECD + ∵ ace, that is,
RELATED INFORMATIONS
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- 9. In the triangle ABC, ab = AC, BD is the center line on the side of AC. BD divides the circumference of ABC into two parts: 36 and 63, and calculates the length of BC Let the waist length of this isosceles triangle be a and the bottom length be B be A+A/2=36 B+A/2=63 A = 24, B = 51 is obviously not true Or a + A / 2 = 63 B + A / 2 = 36 A=42 B=15 establish So BC = 15 Why is BD not included in the weekly schedule
- 10. In an isosceles triangle with a circumference of 10 cm, the length of the bottom edge is x (CM), and the length of the waist is y (CM). Write out the analytic expression of the function of Y with respect to X and the definition domain of the function
- 11. The ratio of the bottom to the height of an isosceles triangle is 8:3. Cut it along the height of the bottom to form a rectangle. The perimeter of the rectangle is 128 cm. What is the area of the rectangle?
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- 13. The area of a triangular grassland is determined by the length of its bottom 20 m and the height 4 m less than the bottom
- 14. The maximum area of the triangle is () A. 85cm2B. 610cm2C. 355cm2D. 20cm2
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- 17. A piece of square iron sheet with a side length of 30cm, subtract the square with a side length of 8cm from its four corners respectively, and then make a uncovered iron box (as shown in the figure) to calculate the volume of the iron box
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- 19. Uncle Zhang uses a fence of 12.56 meters to surround a semicircle chicken farm. How many square meters is the area of this chicken farm?
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