Thursday, May 21, 2009
Geometry (Class 82)
Announcements
Test Friday: Right Triangle Trigonometry, Lines
Lesson Title
Circles (1): Inscribed Arcs
Overview
The opener for today is a short problem which requires the students to apply their trigonometric skills. The lesson picks up where we left off last class with our investigation into the relationships between the measures of inscribed angles, central angles, and their arcs. We will finish this lesson and then have time to work a variety of related problems.
Textbook Sections
ยง10.3 (Txt. p.613) Inscribed Angles
Vocabulary
circle
central angle
arc
arc length
arc angle
inscribed angle
inscribed arc
Key Attitudes
Math is about building up understanding one idea at a time.
Key Ideas
The measure of a central angle is equal to the measure of the arc it insribes.
If a central angle and an inscribed angle inscribe (capture) the same arc, then the measure of the central angle is twice the measure of the inscribed angle.
Key Skills
I can use correct terminology to describe parts of a circle.
I can determine the measures of central angles and inscribed arcs using the relationship between them.
Turn-In (#81)
Test Corrections
Trig. Problems
Handouts
Chapter 10- Lesson 1: Practice 1
Assignment
Chapter 10- Lesson 1 Problems #TBA
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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