Wednesday, May 02, 2007
Geometry (Class 73)
Announcements
Quiz Friday: Chapter 12.1 to 12.5, Chapter 11.1-11.4
CST Part 1, Monday May 14
CST Part 2, Wednesday May 16
Overview
In today’s lesson we pick up a few miscellaneous ideas as well as begin our study of transformational geometry. In particular we learn: 1) how to find the length of an arc when we know the measure of the central angle and the circumference of a circle, 2) about the areas of similar shapes which have twice the perimeters, 3) how the coordinates of the vertices of a shape are affected by slides and reflections.
Textbook Sections
§11.4 (Txt. p.683) Circumference and Arc Length
§7.4 (Txt. p.421) Translation and Vectors
§7.2 (Txt. p.404) Reflections
Vocabulary
arc
arc length
Key Attitudes
Mathematics is about looking for patterns.
Key Ideas
The arc length can be calculated using the measure of the central angle and the length of the circumference of a circle.
If the perimeter of a shape is doubled, the area of the shape is squared.
Slides and reflections change the coordinates of a shape in predictable ways.
Key Skills
Finding arc length.
Finding area of similar shapes.
Predicting the coordinates of the vertices of a shape after a slide or reflection.
Turn In
§11.1 (Txt. p.665) #10-12, 18, 20, 24, 33-36
§11.2 (Txt. p.672) #9, 16, 19
Handouts
No handouts posted.
Assignment
§11.4 (Txt. p.686) #15-18, 20, 21, 24, 25, 31, 45, 48, 49
Txt. p.675 Mixed Review #54, 56, 57-64
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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