Equilateral triangles are both axisymmetric and centrosymmetric, right
It's an axisymmetric figure, not a centrosymmetric figure
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- 1. How to draw centrosymmetric figure in mathematics? For example, how to draw when you rotate 180 ° around a certain point?
- 2. How to draw a centrosymmetric figure?
- 3. 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
- 4. 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
- 5. 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
- 6. 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
- 7. The surface area of the geometric figure obtained by rotating the rectangle with the side length of 2cm and 4cm around one side is?
- 8. 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______ .
- 9. 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
- 10. 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?
- 11. Are regular octagons and regular triangles centrosymmetric
- 12. Are rays, equilateral triangles and pentagons centrosymmetric? Why? RT
- 13. Is an equilateral triangle a centrosymmetric figure?
- 14. Are isosceles triangles and equilateral triangles centrosymmetric?
- 15. Please draw ABC's centrosymmetric figure about point d with ruler drawing method
- 16. 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.
- 17. 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
- 18. 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
- 19. In triangle ABC is equilateral triangle, if angle Abe = angle BCF = angle CAD, is triangle def equilateral triangle? Why?
- 20. As shown in the figure, △ ABC is an equilateral triangle, points D, e and F are on the sides of AB, BC and Ca respectively, and △ DEF is an equilateral triangle. Proof: △ ADF ≌ △ CFE