Thursday, April 17, 2008
Geometry (Class 71)
Announcements
Next test is next Friday, April 26. The following test will not be until May 23 due to STAR testing-- that test will cover a lot of material!
Lesson Title
The Measure of an Inscribed Angle
Overview
The warm-up for today focuses on understanding how the altitude of a cone is related to the radius of the base and the slant height of the cone. Our lesson continues from last class, focusing on inscribed angles of a circle and the inherent relationships.
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 height of the cone and another piece of information which allows for the finding of the radius of the base or the slant height of the cone.
Use relationships of inscribed angles to find missing angle measures.
Turn-In (#70)
§9.5 (Txt. p.563) #55
CST Practice #22- 49
Finish Warm-Up
Test Corrections
Handouts
12.11- Cone 4: Finding the Altitude of a Cone
Assignment
CST Practice
Finish Warm-up
Finish Chapter 10- Lesson 1
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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