4.4 Triangle Congruence SSS, SAS
Sunday, October 31, 2010
4:49 PM
Learning Target 4.4: Prove triangles congruent.
Vocabulary:
Triangle rigidity -
Included angle -
Theorems:
In proofs:
You may shorten this to SSS or SAS but….behind these letters
Chapter 4 Page 1
put a ( ) with the numbers of the steps you used for each
congruent piece of the triangle.
Example:
Reason:
SSS Congruence (1, 2, 5)
Examples:
1. Show that the triangles are congruent for the given value of the
variable.
∆STU  ∆VWX, when y = 4.
2.
Explain why ∆ABC
 ∆DBC.
3.
Explain why ∆XYZ
 ∆VWZ.
Chapter 4 Page 2
Given: BC ║ AD, BC  AD
4.
Prove: ∆ABD  ∆CDB
Chapter 4 Page 3