Lesson 31-41

3. of a triangle-The point of concurrency of the three angle bisectors of a triangle.
6. line-The line containing the circumcenter,centroid,and orthocenter of a triangle.
7. of a triangle- The point of concurrency of the three medians of a triangle.
9. of a triangle-The point of concurrency of the three perpendicular bisectors of a triangle-
12. reciprocal-The opposite of the reciprocal of a number.
15. length-The distance along an arc measured in linear units.

1. proof-A style of proof in which the statements and reasons are presented in paragraph form.
2. of a triangle-The point of concurrency of the three altitudes of a triangle.
4. of a triangle-A segment whose endpoints are vertex of the triangle and the midpoint of the opposite side.
5. circle-A circle that contains all vertices of a polygon.
8. of a triangle-The perpendicular segment from a vertex to the line containing the opposite side.
10. proof-A style of proof that uses boxes and arrows to show the structure of the proof.
11. of concurrency-A point where three or more lines intersect.
13. of a circle-A region inside a circle bounded by two radii of the circle and their intercepted arc.
14. lines-Three or more lines that intersect at one point.