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2. figure A plane figure made up of simple shapes or a three dimensional figure made up of simple three-dimensional figures
4. of a triangle-The point of concurrency of three altitudes of a triangle
6. of a triangle-The point of concurrency of the three medians of a triangle also known as the center of gravity
7. length The distance along an arc measured in linear units
9. of a triangle-The perpendicular segment from a vertex of the line containing the opposite side
12. of a triangle The point of congruence of three perpendicular bisectors of a triangle
13. line The line containing the circumcenter centroid & orthocenter of a triangle
15. proof- -A style of proof in which the statements and reasons are presented in paragraph form
16. reciprocal The opposite of the reciprocal of a number

1. polygon A polygon for which every vertex lies on the same Circle
3. of a triangle The point of congruence of the three angle bisectors of a triangle
5. circle A circle that contains all vertacies of a polygon
6. lines-Three or more lines that intersect at one point
8. proof-A style of proof that uses boxes and arrows to show the structure of proof
10. of a triangle-A segment whose endpoints are a vertex of the triangle and the midpoint of the opposite side
11. of a circle A region inside a circle bounded by two radii of the circle and their intercepted Arc
14. of congruency A point where three or more lines intersect