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Regular triangle, circle, parallelogram, regular pentagons, which are centrosymmetric figures
Circle, parallelogram
Is an equilateral triangle a centrosymmetric figure?
No, centrosymmetry is to rotate a figure 180 ° around a certain point to coincide with the figure. You can imagine that an angle of an equilateral triangle is upward, and the angle will be downward after 180 ° rotation, so it can't coincide with the original figure
Is an equilateral triangle a centrosymmetric figure? 3Q
No, because it only needs to rotate 120 degrees
RELATED INFORMATIONS
- 1. Are equilateral triangles and five pointed stars on the national flag centrosymmetric
- 2. Is an equilateral triangle a centrosymmetric figure?
- 3. Known: point a (- 2,0), B (3,0), point C on the Y-axis and the area of △ ABC is 15, find the coordinates of point C
- 4. If the images of y = - X-B * 2 and y = 2x + 4 intersect at a point of x-axis, a and y-axis intersect at B and C respectively, how to find the angle ABC area
- 5. The rectangle with the length of 4cm and the width of 2cm respectively revolves around the straight line where the length and the width lie to get two geometric bodies. Which geometric body has the largest volume and the surface area? Drawing calculation instructions
- 6. The length of three sides of a right triangle is 3, 4 and 5. If each side is rotated for one circle, what geometry is obtained? What are their volumes
- 7. For a right triangle, the two right sides are 6cm and 9cm respectively. After rotating along one right side for a circle, a cone is obtained. What is the volume of the cone?
- 8. The two right sides of a right triangle are 12 cm and 8 cm respectively. If you rotate along one of the right sides as an axis, you will get a cone. What is the maximum volume of the cone?
- 9. Right triangle, right side is 4cm, 3cm respectively, with a right side as the axis rotation, get a cone, what is the maximum volume?
- 10. There are two cones with equal ground area. One cone is 4 decimeters high and 48 cubic decimeters in volume. The other cone is 3 decimeters high. What is the volume? (using proportional solution)
- 11. Line segment equilateral triangle in isosceles triangle is both axisymmetric figure and centrosymmetric figure?
- 12. Drawing the center of gravity of any triangle ABC with ruler
- 13. If the radius of the inscribed circle of △ ABC is R and the perimeter of △ ABC is l, then the area of △ ABC is___ ．
- 14. Known: a (0,1), B (2,0), C (4,3) (1) find the area of △ ABC (2) set point P on the coordinate axis, and the area of △ ABP and △ ABC
- 15. As shown in the figure, △ ACD, △ Abe, △ BCF are equilateral triangles on the same side of the straight line BC. (1) when ab ≠ AC, it is proved that the quadrilateral ADFE is a parallelogram; (2) when AB = AC, what kinds of graphs are formed by successively connecting four points a, D, F and E? Write directly the types and corresponding conditions of the figures
- 16. Circle O is the inscribed circle of RT triangle ABC, DEF is the tangent point, and the extension line of de intersects the extension line of AC at g to prove BD = CG
- 17. As shown in the figure, point D is a point on the AB extension line of the equilateral triangle ABC. Take CD as the side length, make the equilateral triangle CDE, and calculate the degree of the angle EBD
- 18. In △ ABC, Ba bisects ∠ DBC, ∠ BAC = 118 ° BD ⊥ AC in D, and calculates the degree of ∠ C
- 19. E. B and C are on the same straight line, Ba bisects ∠ EBD, ∠ DBC = 30 ° and calculates the degree of ∠ ABC
- 20. It is known that, as shown in the figure, angle ABC = angle DCB, BD and Ca are the bisectors of angle ABC and angle DCB respectively