Friday, March 13, 2009
Geometry (Class 60)
Lesson Title
Similar Triangles (3)
Overview
The opener today will be an algebra review. The lesson will focus on how the lengths of the corresponding sides of similar triangles are related. During the last part of the class students will take Test 10 which focuses on using congruent triangles
Textbook Sections
§8.4 (Txt. p. 480) Similar Triangles
Vocabulary
construction
straight edge
arc
radius
center
diameter
adjacent
opposite
included
non-included
SSS
ASA
SAS
AAS
HL
Key Attitudes
Math is about building up understanding one idea at a time.
Key Ideas
Triangles can be constructed out of various combinations of angles and sides.
Only some combinations of angles and sides guarantee that all triangle created with this combination will be congruent-- the same size and the same shape. Other combinations only guarantee triangles which are the same shape, and some combinations guarantee nothing at all!
Triangles which are the same shape always have some key attributes.
Key Skills
I can identify key angle and side combinations which force triangles to be congruent.
I can identify and sequence the reasons which establish triangle congruence.
I can use congruent triangles to prove other facts.
I can use a straight edge and compass to construct geometric shapes.
Turn-In (#59)
Txt. p.250 #1, 2 (Hint: Do you see isosceles triangles?)
Txt. p.258 #28-30, 43-48
Handouts
No Handouts Posted
Assignment
Finish worksheets 8.4B and 8.5A
Disclaimer- The assignment as stated in class is the official assignment. Every effort is made to keep this posting accurate, but you should refer to what was stated in class as the final word.
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