geometry

8. a circle is the distance along an arc measured in linear units
9. the point of concurrency of the three altitudes of a triangle
10. any circle that contains all the vertices of a polygon
11. a plane figure made up of simple shapes or a three dimensional figure made up of simple three dimensional figures
12. where three or more lines intersect in one place
14. the point of concurrency of the three medians of a triangle
15. a segment whose endpoints are a vertex of the triangle and the midpoint of the opposite side
16. when the product of two numbers is -1

1. a perpendicular segment from a vertex to the line containing the opposite side
2. two line intersect at exactly one point
3. a style of proof in which statements and reasons are presented in paragraph form
4. the point of concurrency when all three angles of a triangle are bisected
5. any polygon with each vertex on a circle
6. a line going through several important triangle centers
7. the region inside a circle bounded by two radii of the circle and their intercepted arc
13. a style of proof that uses boxes and arrows to show the structure of the proof