Circle Review

6. a polygon with seven sides and seven angles
8. a straight line and an arc have two common points
9. one line and one circle or two circles have two common points
12. the angle between two adjacent sides of a polygon
13. a polygon with eight sides and eight angles
14. the circumference is intersected with the vertices of the polygon
19. d=R+r
20. the longest chord in a circle
21. the triangle that at least two sides are equal
22. a polygon with equal sides and angles
25. d=R-r
27. a moving point moves a circle around a fixed point for a certain distance
29. a polygon with six sides and six angles
30. a polygon with five sides and five angles
31. a pattern formed by an arc and two radii passing through each end of the arc
32. a polygon with ten sides and ten angles

1. three angle bisectors’ node in a triangle
2. a parallelogram which adjacent sides are equal and one angle is a right angle
3. a closed 2d figure enclosed by four uncrossed line segments that are not on the same straight line
4. a closed graph formed by the sequential connection of three line segments that are not on the same straight line
5. the distance from the center to the circumference
7. one line is at a right angle to the other
10. the line segment between two points on the circle
11. a pattern formed by three or more than three sides
12. the triangle which three vertices are all on the circumference
15. the triangle that each side are equal and each interior angle are equal too
16. a polygon with twelve sides and twelve angles
17. one line segment divided into two equal line segments
18. the angle between two adjacent sides’ extension cord of a polygon
23. distance from the chord to the center
24. three midlines’ node in a triangle
26. a line has only one common point of a circle
28. a polygon with nine sides and nine angles