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This The Sum of Angles in a Triangle handout also includes:
An informative lesson contains a brief explanation of how the sum of the angles of a triangle is a line. The lesson continues with determining the missing angle in a triangle, or solving for a variable. Using the sum of the angles, the lesson introduces how to find the measure of an exterior angle of a triangle.
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CCSS:
Designed
Concepts
Additional Tags
Instructional Ideas
- Review solving linear equations
- Have the class determine why the sum of the angles of a triangle equal 180 degrees
Classroom Considerations
- Make sure the class knows how to solve the types of equations needed
- The lesson is eighth in an 11-part unit on congruence and similarity
Pros
- Includes a video lecture from a teacher
- Provides several problems of different levels
Cons
- The lesson relies on direct instruction as the sole instructional strategy