Are line segments and angles axisymmetric?
Both are axisymmetric figures. The concept of angle 1: a figure composed of two rays with a common endpoint is called an angle. The common endpoint is called the vertex of the angle, and the two rays are called the two sides of the angle. The concept of angle 2: the figure formed by a ray rotating from one position to another around its endpoint is called an angle
RELATED INFORMATIONS
- 1. A circle is an axisymmetric figure, and each diameter is its axis of symmetry______ .
- 2. It is known that a is the unit vector in the plane. If B is multiplied by (a-b) = 0, then the value range of | B | is I believe you are the best
- 3. As shown in the figure, △ ABC, D and E are the midpoint of BC and AC respectively. BF bisects ∠ ABC and intersects de at point F. if BC = 6, the length of DF is______ .
- 4. What is the formula for finding the cosine of the angle between two known vectors?
- 5. It is known that ∠ ace = ∠ CDE = 90 °, point B is on CE, CA = CB = CD, through the circle intersection ab of a, C and D to f (as shown in the figure). It is proved that f is the heart of △ CDE
- 6. Can multiplication of vector modules be equal to negative values For example: can a module multiply B module equal to minus one? I do a math problem, is two modules multiplied by negative one ~
- 7. It is known that, as shown in the figure, the vertices of the equilateral triangle def are on the edges of the equilateral triangle ABC. Proof: ad = be = CF
- 8. The vector a = (COSA, Sina), B = (- 1,2,3,2) proves that the vector a + B is perpendicular to a-b. when 2A + B = a-2b, the angle α is obtained
- 9. It is known that the three sides of a triangle form an arithmetic sequence, the perimeter is 36 cm and the area is 54 cm 2
- 10. Given the function f (x) = ln (1 + x) - X1 + X. (1) find the minimum of F (x); (2) if a, b > 0, prove: LNA LNB ≥ 1-ba
- 11. The application of mathematical equation of one variable and one degree (Grade 6 of middle school) gives high marks During the "June 1" period, when a certain kind of children's clothing is sold in a shopping mall, it can make a profit of 45 yuan per piece. If it is sold at a 15% discount, the profit of each piece is 30 yuan less than that of the original one. How much is the purchase price of this children's clothing? On the application of linear equation of one variable
- 12. In a 1:500 scale plan, the perimeter of a rectangular classroom is 10cm, and the ratio of length to width is 3:2 2. Write the ratio of the area on the graph to the time area, and compare it with the scale. What do you find?
- 13. Why is it that the rounder the moon, the fewer stars there are
- 14. If ABC = 1, then the value of AAB + A + 1 + BBC + B + 1 + CCA + C + 1 is () A. 1B. 0C. -1D. -2
- 15. If the area of the trapezoid is 48 square centimeters and its height is 6 centimeters, and its bottom is 1 centimeter less than twice that of the top, then what is the top and bottom of the trapezoid?
- 16. In the regular tetrahedron ABCD, e and F are the midpoint of AC and CD respectively, and the cosine value of the angle formed by the lines be and AF on the different planes is calculated
- 17. Given the function f (x) = 2 ^ x + 2 ^ (AX + b), and f (1) = 5 / 2, f (2) = 17 / 4 (1) Find the value of a and B (2) judge the parity of F (x) (3) try to judge the monotonicity of F (x) on [negative infinity, 0] and prove it; (4) find the minimum value of F (x)
- 18. Let f (x) = (2x + 3) / (x-1) (x is not equal to 1), the image of function y = g (x) and the image of function y = F-1 (x + 1) be symmetric with respect to the straight line y = x, then G (3) is obtained
- 19. If f (x) defined on R satisfies f (x + y) = f (x) + F (y) + 2XY (x, y ∈ R), f (1) = 2, then f (- 3) is equal to () A. 2B. 3C. 6D. 9
- 20. If the function f (x) defined on R satisfies f (x + y) = f (x) + F (y) + 2XY (x, y belongs to R), f (1) = 2, then f (- 2) is equal to