Chapter 14 Axisymmetric Unit Test 2 1. Multiple choice questions: 1. Among the following options, the axisymmetric one is () a.a.b.c.b.c.d.2. In traditional wooden houses in China, windows are often decorated with various patterns, as shown in the figure, which is a common pattern with () symmetry axis. A. 1b.2c.3d.4 Question 2 Figure 3. As shown in the figure, it is a part of roof truss design, point D is the midpoint of inclined beam AB, columns BC and DE are perpendicular to cross beam AC, AB = 8m, ∠ A = 30, then DE is equal to () a.4mb.3mc. There is () a.1b.2c.3d.45. If the triangle. The figures symmetrical to Figure ① are () A, ④ and 2B. ④ and 3C. ② and 5D. ② and 37. The number of symmetry axes of an isosceles triangle is () A. 1 B.3 C. 1 or 3d08. The following plane graphics, asymmetric is (). 10. As shown in the figure, △ABO is axisymmetric, and the coordinates of point A are (1, -2), so the coordinates of point B are _ _ _ _ _ _ _ _. Picture 10, picture 1 1. As the picture shows, the shepherd boy is herding cattle at A, and his home is at B. The distances from A and B to the river bank are AC and BD respectively, and AC=BD. If the distance from point A to the midpoint of CD on the river bank is 500 meters, the shepherd boy will take A's cow to the river bank to drink water and then go home. The shortest distance is _ BD. Drawing 1 1 drawing 12 drawing 12. As shown in the figure, AB=AC, ∠ A = 40o, and the perpendicular line MN of AB intersects AC at point D, then ∠ DBC = _ _ _ _ _ _ 13. Observe the following figures, and there are _ _ _ _ _ _ axisymmetric figures. 14. When Wang Hong writes her resume in English on the computer, she turns one of the sentences upside down: then the English sentence she wants to write should be _ _ _ _ _ _ _ _ _. 15. Li Fang's jersey number is 253. When he put the mirror on the right side of the number, the number in the mirror looks like _ _ _ _ _ _. 16. There will be some interesting symmetrical forms in the operation of numbers. Fill in the blanks according to the form of equation (1) and check whether the equation is true: (1)12× 231=132× 21; (2) 12×462=_____×_____; (3) 18×89 1=_____×_____; (4)24×23 1=_____×_____。 Iii. Answer questions: 17. The national flag is a symbol of a country. Observe the following national flags, which are axisymmetric figures? Find their symmetry axes. 18. Compose the following figures into an axisymmetric figure with line A as the axis of symmetry. 19. Observe all kinds of figures in the picture, tell which figures can be put together to form the symmetry axis, and explain them in categories. (Graphics can be placed up and down or left and right) 20. As shown in figure 13, a ship observed that Island B was 30o north-east at1:30, and sailed eastward to Island C at the speed of 10 knots, and then observed that the island was 60o north-east, and the ship was 40 nautical miles away from the island. (1) Find the time when the ship arrives at point C; (2) If the ship continues to sail eastward from point C, when will it reach point D just south of island B? 2 1. As shown in the figure, A, B and C are three newly-built communities. We built a school at the same distance from three residential areas. Now it is planned to build residential area D, and its requirements are: (1) The distance from the school is the same as other residential areas; (2) Controlling population density is beneficial to ecological environment construction. Try to determine the location of residential area D. 1. Multiple choice questions: 1. d； ; 2.b； 3.c； 4.c； 5.a； 6.b； 7.c； 8.a； 2. Fill in the blanks:11.1000; 12.30 ; 13.8 ; 14. I am 14 years old this year, 15. ①; 16.264 , 2 1 ; 198 , 8 1 ; 132 , 42 。 Third, the answer: 17. 18. 19. Left and right can form an axis symmetry: (1) and (6), (2) and (4), (9) and (10); There are (2) and (4), (5) and (10), (7) and (8) placed above each other to form an axial symmetry. 20.( 1) The time for the ship to arrive at point C is 3: 30 pm; (2) The ship arrived at D, just south of B Island, at 5: 30 pm. 2 1. First find out the location of the school, then draw an arc with the school as the center and the distance to A as the radius, and make the midpoint D of the arc AB. Chapter 14 axisymmetric unit test 2 1. Multiple choice questions: 1. Among the following options, the one that is symmetrical is () A.A.B.C.B.C I think it is very complicated to add answers to the first volume of mathematics in grade six. I tried my best to answer these questions. Give me the best answer. Thank you! gangue crusher