Circle Review

5. the distance around a circle
7. the line to a plane curve at a given point is the straight line that "just touches" the curve at that point.
9. the center of mass of two or more bodies that orbit one another and is the point about which the bodies orbit.
12. a line segment joining two points on a curve
14. the general activity of dividing a geometric figure into two equal parts.
18. a triangle that has two sides of equal length.
20. a circle that passes through all the vertices of the polygon.
21. is an angle formed by one side of a simple polygon and a line extended from an adjacent side.
24. surrounded by and contact by a line around another geometric shape.
25. four equal sides and four equal angles (90-degree angles, or (100-gradian angles or right angles).
26. a plane figure that is described by a finite number of straight line segments connected to form a closed polygonal chain or polygonal circuit.
27. any straight line segment that passes through the center of the circle and whose endpoints lie on the circle.
29. an eight-sided polygon or 8-gon
30. a polygon with three edges and three vertices.
31. a line segment from the center to the midpoint of one of its sides.
33. a ten-sided polygon or 10-gon
34. a nine-sided polygon or 9-gon.

1. a curve is a line that intersects the curve in at least two (distinct) points.
2. the relationship between two lines which meet at a right angle (90 degrees).
3. a triangle that is enclosed by and "fits snugly" inside another geometric shape or solid.
4. any five-sided polygon or 5-gon.
6. the portion of a disc enclosed by two radii and a circular arc
8. a point, line, or curve common to two or more objects (such as lines, curves, planes, and surfaces).
10. a circle or sphere is any of the line segments from its center to its perimeter
11. the angle inside two adjacent sides of a polygon
13. a point defined for any triangle in a way that is independent of the triangle's placement or scale.
15. enclosed by and "fits snugly" inside another geometric shape or solid.
16. a polygon with four edges (or sides) and four vertices or corners
17. a triangle in which all three sides are equal.
19. any twelve-sided polygon.
22. a polygon that is equiangular (all angles are equal in measure) and equilateral (all sides have the same length).
23. a seven-sided polygon or 7-gon.
28. the set of points which are an equal distance to a fixed point
32. a six-sided polygon or 6-gon.