The line segment connected to the corresponding point of an axisymmetric figure is divided into symmetry axis (), corresponding line segment (), corresponding angle ()

Bisection, perpendicularity, equality

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1. [emergency help] ask for the answer in two hours: in the triangular prism abc-a1b1c1, the side edge Aa1 is vertical to the bottom ABC.AB Vertical BC, D is the midpoint of AC, A1A = a [emergency help] ask for the answer in two hours: in the triangular prism abc-a1b1c1, the side edge Aa1 is vertical to the bottom ABC.AB Vertical BC, D is the midpoint of AC, A1A = AB = 2, BC = 3. Find (1) proof: Ab1 parallel BC1D (2) find the volume of pyramid b-aa1c1d9
2. As shown in the figure, in the known trapezoidal ABCD, ad ‖ BC, BC = 3aD, e is a point on the waist AB, connecting CE, (1) if CE ⊥ AB, ab = CD, be = 3aE, find the degree of ∠ B; (2) let the area of △ BCE and quadrilateral AECD be S1 and S2 respectively, and 2S1 = 3s2, try to find the value of beae
3. When the two sides of a triangle are 8 cm and 4 cm long, the length of the third side may be () cm A. 3B. 4C. 7
4. Try to discuss the position relation between the straight line X-my + 2 = 0 and the circle X & sup2; + Y & sup2; = 1 according to the value of M A differential geometry problem, there must be a problem-solving process
5. When x is equal to - 1, the value of the third power of the polynomial ax + bx-3 is 2; when x = 1, what is the value of the polynomial?
6. Solving inequality | x + 3 | + | 2x-1 | ≥ 7
7. 5x-20%x=19.2 3/5:6=（x+3/5）：10 5x-4.5*2=0.5 1/8:1/4=1/10:x How about these,
8. How is the mathematical calculation done in this step? The value of 2 / 4 of (2Y's square + 3Y + 7) is 1 / 4 ｛ 2Y & ｛ 178; + 3Y + 7 = 8 The value of 2 / 2 of (2Y + 3Y + 7) is one fourth ∴2y²+3y+7=8 Why is it equal to eight?
9. Solving equation 1 / 3x + 1 / 2x ≡ 1 / 12
10. (x ^ 2 + 2XY + y ^ 2) + (- 2x + 2Y) + 1 factorization factor No, that's right. That's what it says on the paper
11. An equilateral triangle is an axisymmetric figure. It has () axes of symmetry
12. Is an equilateral triangle an axisymmetric figure? How many axes does it have? What line segments are they
13. A quadrilateral is a centrosymmetric figure and an axisymmetric figure_____________ .
14. The two quadrangles of an axisymmetric figure are also centrosymmetric figures
15. The quadrilateral is not only an axisymmetric figure, but also a centrosymmetric figure______ ．
16. If a quadrilateral is a centrosymmetric figure, then the quadrilateral is a centrosymmetric figure_____ Quadrilateral, based on______________
17. Prove: if a quadrilateral is a centrosymmetric figure, and the intersection of its two diagonals is the center of symmetry, then it is a parallelogram (hint: prove that the diagonals of the two quadrilaterals are equally divided)
18. Is parallelogram the only centrosymmetric figure in quadrilateral? Why? In addition to the general parallelogram, the "parallelogram" mentioned in the question also includes special parallelogram, such as square, rectangle and diamond. I don't know if there are other parallelograms (such as trapezoid, etc.) besides parallelogram in the quadrangle, whether there are also centrosymmetric figures in other quadrangles (such as trapezoid, etc.) In addition, the definition of quadrilateral in junior high school mathematics textbook is as follows: in the same plane, it is a graph composed of four line segments which are not on the same line. It seems that the definition of quadrilateral should be divided into convex quadrilateral and concave quadrilateral
19. Is a quadrilateral of a centrosymmetric figure necessarily a parallelogram Why?
20. What kind of symmetrical figure is a parallelogram Answer before 20:00 on February 19!