In this lesson I will be teaching you various bisector theorems. As I suggested in the previous lesson you really want to make constructions of these triangle theorems as it’s a great way to experience the concepts in real life. My lesson will explore angle and perpendicular bisectors theorems. Just as the name implies an angle bisector is a ray that “bisects” or cuts an angle measure in half. For example an angle bisectors of a 60 degree angle would cut and form two 30 degree angles- you will see this clearly demonstrated in the lesson. Now a perpendicular bisector “cuts” a line segment in half. The key concept about a perpendicular bisector is that it bisects another line “perpendicularly” meaning at a right angle (90 degrees). If your a little confused don’t worry the video will show this much more clearly. As I was saying don’t forget to create constructions on the theorems and properties we cover- it’s a great way to understand and retain the concepts. Lastly keep reviewing your notes as geometry builds on itself. Have you done any algebra problems lately? You should- remember there is algebra in geometry and you should be reviewing algebra as well. Good luck!

TabletClass Math Triangles Bisectors Theorems Lesson from John Zimmerman on Vimeo.