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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.

 

Objective:

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.

 

Investigation:

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

 

Closure:

Class discussion on when to use the Law of Cosines

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