1. Find the missing angle 80 0 20 0 ?0?0

2. Special Segments in Triangles

3. Altitude A Line segment perpendicular to a side that goes through the opposite vertex

4. Altitude Every Triangle has 3 Altitudes

5. Altitude Some Altitudes are External

6. Altitude Right triangles have 2 altitudes that are sides

7. Median A Line segment bisecting a side that goes through the opposite vertex

8. Median A Line segment bisecting a side that goes through the opposite vertex

9. Median Every Triangle has 3 medians

10. Angle Bisector A line segment bisecting an Angle that stops at the opposite side

11. Angle Bisector Every Triangle has 3 angle bisectors

12. Perpendicular Bisector A line bisecting a side that is perpendicular to it

13. Perpendicular Bisector Every triangle has 3 Perpendicular Bisectors

14. Equidistant An Equal distance away from 2 or more points

15. Equidistant C B A If AB @ AC Then A is Equidistant to B and C

16. Perpendicular Bisector Equidistance Theorems A C B If a point is equidistant to the endpoints of a line segment then that point lies on the perpendicular bisector of the line segment

17. Perpendicular Bisector Equidistance Theorems A C B If a point lies on the perpendicular bisector of a line segment then that point is equidistant to the endpoints of that line segment

18. Angle Bisector Equidistance Theorems D T R S Any point on the angle bisector is equidistant from the sides of an angle

19. Angle Bisector Equidistance Theorems D T R S Any point equidistant from the sides of an angle lies on the angle bisector of that angle

20. Do Now! Page 242 18 - 27