Thursday, December 20, 2007
Geometry (Class 39)
Lesson Title
Altitudes of a Triangle
Overview
In today’s class students examine the altitudes of triangles, learning that every triangle has three altitudes. Students use their construction skills to create each of the three altitudes to specific triangles and make observations regarding when the altitude of a triangle will be inside or outside of the triangle. As time permits, students apply their knowledge of the altitudes of triangles to the problem of finding the area of triangles.
Textbook Sections
§5.3 (Txt. p.279) Medians and Altitudes of a Triangle
Vocabulary
altitude
Key Attitudes
Math is about thinking creatively.
Key Ideas
An altitude of a triangle is a perpendicular line segment connecting a vertex of a triangle with its opposite side.
All triangles have three altitudes
Key Skills
Constructing a circle inscribed in a triangle (an “incircle”).
Constructing a circle that circumscribes a triangle (a “circumcircle”)
Turn-In (#38)
Turn in #38
§5.1 (Txt. p.268) #8-13, 16-18, 21-26
§5.2 (Txt. p.275) #5, 10-14
Test Corrections
Handouts
Chapter 5- Lesson 5: Altitudes of a Triangle
Assignment
§5.2 (Txt. p.275) #6, 7, 15, 17, 18, 23
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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