geometry

2. of concurrency- a point where three or more lines intersect.
3. proof- a style of proof that uses boxes and arrows to show the structure of the proof.
5. of a triangle- a segment whose endpoints are a vertex of the triangle and the midpoint of the opposite side.
7. of a circle- a line that intersects a circle at two points.
8. of a triangle- the point of concurrency of the three altitudes of a triangle.
10. of a triangle- the point of concurrency of the three angle bisectors of a triangle.
12. proof- a style of proof in which the statements and reasons are presented in paragraph form.
14. of a triangle- The perpendicular segment from a vertex to the line containing the opposite side.
15. of a triangle- the point of concurrency of the three medians of a triangle. Also known as the center of gravity.

1. of a triangle- the point of concurrency of the three perpendicular bisectors of a triangle.
4. lines- Three or more lines that intersect at one point.
6. reciprocal- the opposite of the reciprocal of a number.
9. circle- a circle that contains all vertices of a polygon.
11. line- the line connecting the circumcenter, centroid, and orthocenter of a triangle.
13. length- the distance along an arc measured in linear units.