Triangles: Finding Interior Angle Measures

The lesson begins with a hands-on activity and then an experiment with a GeoGebra-based computer model to discover the Triangle Angle Sum Theorem. The students write and solve equations to find missing angle measures in a variety of examples.
Resource ID#: 38498 Type: Lesson Plan
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General Information

Subject(s): Mathematics
Grade Level(s): 8, 9, 10, 11, 12
Intended Audience: Educators educators
Suggested Technology: Document Camera, Computer for Presenter, Computers for Students, Internet Connection, Basic Calculators, LCD Projector, Overhead Projector, Adobe Acrobat Reader, Microsoft Office, Java Plugin, GeoGebra Free Software (Download the Free GeoGebra Software)
Instructional Time: 1 Hour(s)
Resource supports reading in content area:Yes
Freely Available: Yes
Keywords: triangle, interior angles, sum of interior angles, Triangle Angle-Sum Theorem, GeoGebra, exterior angle of a triangle, adjacent angles, straight angle, supplementary angles, alternate interior angles of parallel lines.
Instructional Component Type(s): Lesson Plan,  Worksheet,  Educational Software / Tool
Instructional Design Framework(s): Learning Cycle (e.g., 5E), Writing to Learn
Resource Collection: CPALMS Lesson Plan Development Initiative

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