Wednesday, May 28, 2008
Geometry (Class 85)
Announcements
Test today-- Chapter 10: Circles
Lesson Title
Law of Sines 3
Overview
The warm-up for today is an extension of the last class, Students will be working to build their fluency with the Law of Sines which we developed in the last class. We will then push on further into seeing the implications, and limitations, of the Law of Sines by working on Chapter 13- Lesson 2: Careful with the Law. Finally, during the last 15 minutes of class Test 13 will be returned and students will have the chance to make corrections.
Textbook Sections
Supplemental
Vocabulary
center
inscribed angle
central angle
radius (pl: radii)
chord
diameter
sections of intersecting chords
extended chords
inscribe
cyclic quadrilateral
Key Attitudes
Math is about thinking creatively.
Key Ideas
The Law of Sines is a consequence of relationships between arcs and angles of circles.
Th eLaw of Sines can be sued to find missing side lengths or angle measures of triangle including those which are not right triangles.
THe Law of Sines is a proportion stating that the ratio of the side length and the sine of the opposite angle is the same for all side/opposite angle pairs in any triangle.
For any obtuse angle their is a corresponding acute angle with the same sine.
Key Skills
I can use right triangle trigonometry to solve a problem.
I can show how the Law of Sines is a consequence of the relationships between arcs, angles, and segment lengths in a circle.
I can use the Law of Sines to solve for missing length sides and angles in a triangle.
I can recognize a situation where using the Law of Sines would be useful.
I can translate a situation into an equation involving the Law of Sines and solve that equation.
Turn-In (#84)
Benchmark Test 3
Mid-Year Test
Handouts
Chapter 13- Lesson 1: Law of Sines Problems
Chapter 13- Lesson 2: Being Careful with the Law
Benchmark Test 4 Answers
Assignment
Benchmark Test 4
Finish Chapter 13- Lesson 1: Law of Sines (Class Work)
Finish Chapter 13- Lesson 1: Law of Sines (Problems)
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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