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Unit 1, Lesson 1, Investigation 3: The Law of Cosines
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Ithaca High School Lesson Plans

Content Standards and Benchmarks:

II,3,1: Select and use appropriate tools; make accurate measurements using both metric and common units, and measure angles in degrees and radians.

          II,3,5: Use proportional reasoning and indirect measurements including applications of trigonometric ratios, to measure inaccessible distances and to determine derived measures such as density.



After completing the first portion of I3 students will be able to complete the lesson using their knowledge they gained the day before regarding the Law of Sines.


Anticipatory Set:

          Warm-up: Do Checkpoint on Pg 31 regarding the application of the Law of Cosines.



Students will complete I3 of lesson 2 today.  I will guide them to a deeper understanding of the Law of Cosines by giving multiple representations of when and how to apply it and by asking carefully designed questions.


Guided Practice:

Students will work through the next few problems in the text as I circulate and guide them through the problems. 


Independent practice:

Students will be assigned OYO Pg 36, Pg 40 M1, Ex Set 2: 7,8



Class discussion on when to use the Law of Cosines

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