Review for Chapter 4

Tonight's review was pg. 160 #1-20
Tomorrow we will be reviewing more

Ways to Prove Triangles Congruent

• SSS
• SAS
• ASA
• AAS
• HL (Only use with right triangles)

How to prove parts of two triangles congruent

1. Prove the two triangles are congruent by using one of the theorems/ postulates that proves them congruent
2. Then state that the two parts are congruent by using CPCTC ( Corresponding parts of congruent triangles are congruent)
   

Theorems/ Postulates

• Theorems/ Postulates used to prove triangles congruent (SSS, HL, ASA, etc...)
• Isosceles Triangle Theorem: If two sides of a triangle are congruent, then the angles opposite those sides are congruent.
• Converse of Isosceles Triangle Theorem: If two angles of a triangle are congruent, then the sides opposite those angles are congruent.
• If a point lies on the perpendicular bisector of a segment, then the point is equidistant from the endpoints of the segment.
• Converse: If a point is equidistant from the endpoints of a segment, then the point lies on the perpendicular bisector of the segment.
• If a point lies on the bisector of an angle, then the point is equidistant from the sides of the angle.
• Converse: If a point is equidistant from the sides of an angle, then the point lies on the bisector of an angle.

Difference Between Median and Altitude
Median: A segment from the vertex to the midpoint of the opposite side.
Altitude: Perpendicular segment from the vertex to the opposite side.

Reminder
Name triangles so congruent points correspond

Helpful Videos
http://www.khanacademy.org/video/congruent-triangles-and-sss?playlist=Geometry
http://www.khanacademy.org/video/finding-congruent-triangles?playlist=Geometry
http://www.khanacademy.org/video/review-of-triangle-properties?playlist=Geometry

For Chapter Summary pg. 159-160
Test is Wednesday 11/9/11


The next scribe is......... Tim