Circle Review (Steven Li)

2. a point defined for any triangle in a way that is independent of the triangle's placement or scale.
4. an eight-sided polygon or 8-gon
5. a polygon with four edges (or sides) and four vertices or corners
7. a triangle that has two sides of equal length.
11. enclosed by and "fits snugly" inside another geometric shape or solid.
12. the relationship between two lines which meet at a right angle (90 degrees).
13. a ten-sided polygon or 10-gon
16. the line to a plane curve at a given point is the straight line that "just touches" the curve at that point.
17. is an angle formed by one side of a simple polygon and a line extended from an adjacent side.
18. a line segment from the center to the midpoint of one of its sides.
20. the distance around a circle
21. the center of mass of two or more bodies that orbit one another and is the point about which the bodies orbit.
23. a point, line, or curve common to two or more objects (such as lines, curves, planes, and surfaces).
27. a triangle in which all three sides are equal.
28. a polygon that is equiangular (all angles are equal in measure) and equilateral (all sides have the same length).
30. a polygon with three edges and three vertices.
31. a line segment joining two points on a curve
32. the portion of a disc enclosed by two radii and a circular arc
33. the general activity of dividing a geometric figure into two equal parts.

1. four equal sides and four equal angles (90-degree angles, or (100-gradian angles or right angles).
3. surrounded by and contact by a line around another geometric shape.
6. a seven-sided polygon or 7-gon.
8. a circle that passes through all the vertices of the polygon.
9. a six-sided polygon or 6-gon.
10. a triangle that is enclosed by and "fits snugly" inside another geometric shape or solid.
14. a nine-sided polygon or 9-gon.
15. the angle inside two adjacent sides of a polygon
19. any twelve-sided polygon.
22. the set of points which are an equal distance to a fixed point
24. a plane figure that is described by a finite number of straight line segments connected to form a closed polygonal chain or polygonal circuit.
25. any straight line segment that passes through the center of the circle and whose endpoints lie on the circle.
26. any five-sided polygon or 5-gon.
29. a circle or sphere is any of the line segments from its center to its perimeter
32. a curve is a line that intersects the curve in at least two (distinct) points.