How to draw a centrosymmetric figure?

Generally speaking, in a plane, a figure rotates 180 ° around a certain point. If the figures before and after rotation coincide with each other, the figure is called a centrosymmetric figure. Therefore, if you want to draw a centrosymmetric figure, you must first find the reference point, and then draw the figure

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1. As shown in the figure, given points a (- 2,0), B (3,0), point C is on the Y axis, and the area of △ ABC is 15, then the coordinate of point C is
2. As shown in the figure, a (0,2), B (1,0) BC are bisected by y-axis, and the area of triangle ABC is 3. Calculate the coordinates of point C Point C is in the third quadrant
3. As shown in the figure, a (1,0) B (4,0), point C is on the positive half axis of Y axis. If the area of angle ABC is 6, find the coordinates of point C
4. In the triangle ABC, the angle c = 90 degrees, the circle with a point o on AB as the center and the length of OA as the radius is tangent to BC at points D, AC and ab at points E and f respectively (1) If AC = 6, ab = 10, find the radius of ⊙ o; (2) connect OE, ED, DF, EF, if the quadrilateral bdef is a parallelogram, try to judge the shape of ofDe and explain the reason
5. The surface area of the geometric figure obtained by rotating the rectangle with the side length of 2cm and 4cm around one side is?
6. A right triangle with three sides of 3cm, 4cm and 5cm is rotated around the shortest right side to get a right triangle______ And its volume is______ ．
7. The lengths of three sides of a right triangle are 3, 4 and 5 respectively. If each side is rotated one circle, three solid figures are obtained Find the ratio of the largest volume to the smallest volume in the three solid figures
8. There is a mathematical problem: the length of three sides of a right triangle is 3, 4 and 5. If you rotate each side as an axis for one circle, what geometry will you get? What are their volumes?
9. If you rotate a right side of a right triangle as an axis, you will get a cone. How to get the maximum area of the bottom of the cone?
10. A right triangle, the length of the two right sides are 10 cm and 6 cm respectively. Take the two right sides as the axis to rotate one circle, get two cones, which one What's the volume of a cone?
11. How to draw centrosymmetric figure in mathematics? For example, how to draw when you rotate 180 ° around a certain point?
12. Equilateral triangles are both axisymmetric and centrosymmetric, right
13. Are regular octagons and regular triangles centrosymmetric
14. Are rays, equilateral triangles and pentagons centrosymmetric? Why? RT
15. Is an equilateral triangle a centrosymmetric figure?
16. Are isosceles triangles and equilateral triangles centrosymmetric?
17. Please draw ABC's centrosymmetric figure about point d with ruler drawing method
18. Finding the inscribed circle of triangle ABC What about the vertical line from the center to the edge? It's a ruler. You can't use a scale. Only compasses and pens.
19. Known: a (0,1), B (2,0), C (4,3) (1) find the area of triangle ABC (2) point P on the coordinate axis, and triangle ABP and triangle ABC
20. It is known that a (0,1) B (2,0) C (4,3) (1) finds the area of the triangle, and (2) sets the point P on the coordinate axis, and the triangle ABP corresponds to the area of the triangle ABC Finding the p-coordinate of a point Mainly (2) Talk about it