Tuesday, October 14, 2008
Geometry (Class 17)
Lesson Title
Angles and their Measures
Overview
The warm-up today, “Figure It Out! (1)” introduces students to finding the sum of the interior angles of polygons. Students are asked to use clues related to the sum of the interior angles of polygons to make deductions about 3 figures. We also have a model drawing problem today which continues with finding the distance between points in the coordinate plane.
The lesson for the day continues to focus on measuring angles but shifts away from physically measuring them with a protractor to deducing measurements using algebra. Students also work more with finding the midpoint of a segment.
Textbook Sections
§1.4 (Txt. p.26) Angles and Their Measures
§1.5 (Txt. p.34) Segment and Angle Bisectos
Vocabulary
acute angle
obtuse angle
right angle
straight angle
supplementary angles
complementary angles
adjacent angles
bisect
Key Attitudes
Math is about thinking creatively.
Key Ideas
An angle is created by two rays which have a common endpoint.
The measurement of an angle describes the amount the angle is “open” and can be measured in degrees.
Angles can be classified by their measure.
Key Skills
I can measure angles with a protractor.
I can identify and name angles using one letter, three letters, or numbers and can determine which approach is acceptable in a given situation.
I can classify an angle by its measure- acute, right, obtuse, straight.
I can write equations to represent relationships between angle measures and then solve these equations to determine the measure of an angle.
I can use the concept of “bisect” to find angle measures.
I can find the midpoint of a segment when given the coordinates of its endpoints.
Turn-In (#16)
Finish Chapter 1- Lesson 2 Practice Problems
Handouts
No Handouts Posted
Assignment
Test Corrections
Txt. p.29 #17-25
Txt. p. 32 #61-64, 70-73, 74-76
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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