Monday, October 23, 2006
Geometry (Class 19)
Overview
§4.3 (p.212) Proving Triangles are Congruent using SSS and SAS.
Today we focus on the question “What information do we really need in order to know that two triangles are congruent?” In Investigation 4.3 (p.211) students explore the concept of SSS and SAS by using pencils to see if they can make two triangles NOT congruent when their sides are the same length or when two sides and the angle inbetween the sides are congruent. This work leads us to develop four fundamental approaches for proving triangles congruent.
Key Ideas
Two triangles can be inferred to be congruent using a minimum amount of information.
Vocabulary
Assignment
Proofs for Practice #8
§4.2 (Txt. p.206) #17, 18, 25-28, 35
§4.3 (Txt. p.216) #3-5, 13, 14, 16, 20, 22
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