1. Name Geo / Period (s) 12/02/09 Day # 29

2. Obj: Identify & use bisectors, medians, and altitudes in triangles (4

3. What is a perpendicular bisector?
A line, segment, or ray that passes through the midpoint of the side and perpendicular to that side.

4. What is concurrency?
3 or more lines intersect a common point

5. What is a circumcenter?
point of concurrency of the perpendicular bisectors
equidistant from the vertex of the triangle.

6. What is an angle bisector?
A line, segment, or ray that divides an angle into two congruent angles.

7. What is an incenter? Point of concurrency of the angle bisectors
Equidistant from each side of the triangle.

8. What is a median?
A segment whose endpoints are a vertex of a triangle and the midpoint of the side opposite the vertex.

9. What is a centroid? Point of concurrency of the medians
Located 2/3 of the distance from a vertex to the midpoint of the side opposite the vertex on a median.

10. What is an altitude?
A segment from a vertex to the line containing the opposite side and perpendicular to the line containing that side.

11. What is an orthocenter?
Point of concurrency of the altitudes

12. H.W. Section 5-1 worksheet do all.
Practice Exam:
Wed # 13-18
Thurs # 19-24
Fri # 25-30
There is a quiz on Friday Dec. 4th on Sections 1-6 & 5-1.
Don’t forget to summarize your notes

13. We took a quiz on Tuesday Nov
***We took a quiz on Tuesday Nov. 24th and those that were absent need to make it up by this Friday, Dec. 5th. If you do not like your grade and would like half credit back, you also must come in by this Friday, Dec. 5th to do corrections with me. ***