![](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 cross section of the reservoir dam is trapezoidal, the width of the dam crest is 5m, the slope ad = 6 √ 2m, the dam height is 6m, and the slope of the oblique wave bc i = 1: √ 3, Calculate the low width ab of the dam and the slope angle ∠ a of the slope ad
The slope of oblique wave bc i = 1: √ 3, so CF / BF = tanb = 1: √ 3, BF is the height of dam 6 meters, so BF = 6 √ 3 meters, De is also the height of dam 6 meters, and De is perpendicular to AB, slope ad = 6 √ 2 meters, in right triangle ade, ad is the hypotenuse, so ad & # 178; = ae
The cross section of a seawall is trapezoidal, the upper and bottom ad is 4m, the slope of the upstream surface (slope AB) is I1 = 1: root 3, and the length of slope AB is 12m,
The slope of backwater slope (slope CD) is I2 = 1:1, and the slope angle of (1) slope AB, (2) the width of embankment bottom BC and the length of slope CD are calculated
(1) If the length of slope AB is 12 m, the slope angle of slope AB is 30 ° and the opposite side of slope AB is half of the slope. If the height of dike top is 6 m, the slope length is 6 * (root 3) = 10.39 m, the backwater slope (inclined slope) is 6 m
As shown in the figure, the cross section of a reservoir dam is an isosceles trapezoid with a crest width of 6 meters and a dam height of 10 meters. The slope of slope AB is 1:2 (AR: BR). Now, if the crest width and slope gradient are unchanged, how much earthwork is needed to reinforce a 50 meter long dam
∵ in RT △ ABR, the slope of slope AB is 1:2, ar = 10, ∵ br = 20m, and∵ trapezoid ABCD is isosceles trapezoid, then BC = 2Br + ad = 46m, ∵ s trapezoid ABCD = (AD + BC) × ar △ 2 = 260m2, ∵ the slope of AB has no change before and after the transformation, and eh ⊥ BC is made at point h through point E
RELATED INFORMATIONS
- 1. The cross section of a section of Zhanghe reservoir dam is isosceles trapezoid, the width of dam crest is 6m, the width of dam bottom is 126m, the slope gradient is 1: root 3, then the slope angle and height of the dam here are?
- 2. E. F is the key points of AD and BC on the sides of ABCD, and G and H are the midpoint of BD and AC fast
- 3. In trapezoidal ABCD, AD / / BC, median EF = 17cm, AC vertical BD, angle DBC = 30 degrees, calculate the length of diagonal AC
- 4. Tana * tanb is known in triangle ABC
- 5. Given the set a = {2,3, A2 + 1}, B = {A2 + a-4,2a + 1,1}, and a ∩ B = {2}, find the value of A
- 6. If the tolerance of arithmetic sequence an is - 1 and a1 + A2 + a3 +... + A2008 = 5022, then A2 + A4 + A6 +... + A2008 =?
- 7. For integers a, B, C, D, the symbol ∣ A / D - B / C ∣ denotes the operation AC – BD. given that 1 ∣ 1 / D - B / 4 ∣ 3, what is the value of B + D?
- 8. Two kinds of operations are defined, i.e. "0" and "0". For any two integers, a, B, a, B = a + B-1, a, B = a * B-1, the I'm not allowed to finish the title : (1) the value of 4 0 [(16 ￣ 8) ￣ (3 ￣ 5)] (2) If x [
- 9. For any two integers, a "+" B = a + B-1, a "×" B = axb-1, Find the value of 4 "×" [(6 "+" 8) "+ (3" × "5)]
- 10. Let a, B, C and d be nonnegative integers, then AC + BD + AD + BC = 1997, then a + B + C + D=______ ．
- 11. In the trapezoid ABCD, ad ‖ BC, angle a = 90 °, ab = 7, ad = 2, BC = 3, whether there is a point P on the straight line AB, and find out the length of AP In the trapezoidal ABCD, ad ‖ BC, ∠ a = 90 °, ab = 7, ad = 2, BC = 3, ask whether there is a point P on the line AB, so that the triangle with P, a, D as the vertex is similar to the triangle with P, B, C as the vertex? If not, please explain the reason; if so, how many p points are there? And calculate the length of AP
- 12. There are four digits ABCD, and ABCD = (AB + CD) square, find all such four digits
- 13. As shown in the figure, ab ⊥ BC, BC ⊥ CD, BF and CE are rays, and ∠ 1 = 2, try to explain BF ⊥ CE
- 14. In the triangle ABC, 1. If ∠ C = 90, cosa = 12 / 13, find the value of SINB. 2. If ∠ a = 35, B = 65, try to compare the size of cosa and SINB If this triangle is an arbitrary acute triangle, can we judge the size of cosa + CoSb + COSC and Sina + SINB + sinc There is no graph
- 15. It is known that: as shown in the figure, in trapezoidal ABCD, ad ‖ BC, BC = DC, CF bisects ∠ BCD, DF ‖ AB, and the extension line of BF intersects DC at point E
- 16. It is known that the coordinates of three vertices of square ABCD are a (2,3) B (6,6) C (3,10), and the coordinates of point D can be obtained
- 17. Given the relative vertices a (0, - 1) and C (2,5) of square ABCD, the coordinates of vertices B and D are obtained
- 18. Given the line AB = 8cm, there is a point C on the line AB, and BC = 4cm, and the point m is the midpoint of the line AC, find the length of the line am
- 19. Given that point C is a point on line AB, ab = 12cm, AC: BC = 1:3, and point m is the midpoint of line BC, find the length of line am
- 20. Line AB = 40mm, draw line BC = 16mm on line AB, D is the midpoint of AC, and find the length of CD