Circle Review

2. an angle formed between the side of a shape and the side next to it, when this side is extended
4. a polygon that is equiangular and equilateral
6. the set of all points in a plane that are at a given distance from a given point
7. a polygon with four edges (or sides) and four vertices
9. part of the circumference
13. the regular one has 27 diagonals
15. occur when two circles on the same plane intersect at exactly one point, but one circle lies outside the other circle
16. to divide something into two equal parts
17. dozen
18. an angle of a polygon contained between two adjacent sides
19. a triangle that has all of its vertices on a circle
21. a straight line that touches the circle at one point
26. a triangle in which all three sides are equal
27. a line from the center of a regular polygon at right angles to any of its sides
29. a 5-sided polygon
30. the plane figure enclosed by two radii of a circle or ellipse and the arc between them
31. a line segment extending from the center of a circle or sphere to the circumference

1. perimeter of a circle
3. a triangle that has two sides of equal length
5. a point or line common to lines or surfaces that intersect
8. at an angle of 90° to a given line
10. the point where the angle bisectors intersect
11. occur when two circles on the same plane intersect at exactly one point and one circle lies within the other
12. a polygon with three edges and three vertice
14. the intersection of the medians
17. sum of all the interior angles is 1440°
20. a circle which passes through all the vertices of the polygon
22. a straight line intersecting the circle at two points
23. the sum of all the internal angles of it is 1080°
24. a figure with at least three straight sides and angles
25. a shape with seven straight sides
28. honeycombed
32. a regular quadrilateral, which means that it has four equal sides and four equal angles