Across
- 2. a polygon with six sides and six angles
- 5. a polygon with nine sides and nine angles
- 7. three midlines’ node in a triangle
- 9. a parallelogram which adjacent sides are equal and one angle is a right angle
- 10. a polygon with twelve sides and twelve angles
- 15. the triangle which three vertices are all on the circumference
- 17. the line segment between two points on the circle
- 21. a closed 2d figure enclosed by four uncrossed line segments that are not on the same straight line
- 23. a pattern formed by an arc and two radii passing through each end of the arc
- 24. the triangle that each side are equal and each interior angle are equal too
- 25. a polygon with eight sides and eight angles
- 26. the longest chord in a circle
- 29. one line and one circle or two circles have two common points
- 30. a polygon with five sides and five angles
- 31. a polygon with equal sides and angles
- 32. distance from the chord to the center
Down
- 1. a pattern formed by three or more than three sides
- 3. the angle between two adjacent sides’ extension cord of a polygon
- 4. the triangle that at least two sides are equal
- 6. a polygon with ten sides and ten angles
- 8. a straight line and an arc have two common points
- 11. one line is at a right angle to the other
- 12. d=R+r
- 13. the circumference is intersected with the vertices of the polygon
- 14. a moving point moves a circle around a fixed point for a certain distance
- 15. d=R-r
- 16. the angle between two adjacent sides of a polygon
- 18. a polygon with seven sides and seven angles
- 19. the distance from the center to the circumference
- 20. one line segment divided into two equal line segments
- 22. a closed graph formed by the sequential connection of three line segments that are not on the same straight line
- 27. three angle bisectors’ node in a triangle
- 28. a line has only one common point of a circle