Tuesday, April 15, 2008
Geometry (Class 70)
Announcements
Test today focusing on right triangle trigonometry. Take a look at your Chapter 9 Preview for specifics.
Lesson Title
The Measure of an Inscribed Angle
Overview
In today’s class the focus of the Warm-Up returns to dealing with surface area and volumes of solids. In particular we focus on learning how to compute the surface area of a cone. The lesson for the day marks the start of Chapter 10 and our work with the geometry of chords, tangents, secants and various angles of circles.
Textbook Sections
§10.3 (Txt. p.613) Inscribed Angles
Vocabulary
center
inscribed angle
central angle
radius (pl: radii)
chord
diameter
Key Attitudes
Math is about thinking creatively.
Key Ideas
A circle is the locus of points equidistant from a given point.
All radii of a circle are congruent.
Any triangle constructed with one vertex at the center of a circle and both other vertices on the circumference of the circle will be an isosceles triangle.
If a triangle is inscribed in a circle such that one side of the triangle is a diameter of the circle, then the triangle is a right triangle.
Key Skills
Find the surface area of a cone when given the radius of the base and the slant height.
Use relationships of inscribed angles to find missing angle measures.
Turn-In (#69)
§9.5 (Txt. p.563) #37-42
Handouts
Chapter 12- Cone 3
Chapter 10- Student Outline
Chapter 10- Lesson 1: The Measure of an Inscribed Angle
Assignment
§9.5 (Txt. p.563) #55
§9.5 (Txt. p.563) #55
CST Practice #22- 49
Finish Warm-Up
Test Corrections
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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