Add a little algebra to the geometry. Class members learn about the Addition Postulate for segments and angles. The pupils use their knowledge of solving equations to find lengths of segments and measures of angles. Individuals apply their knowledge with an application problem and by completing a proof involving the Addition Postulate.

Concepts

addition angles, segments, angle measurement, angles, algebraic equations, equations, collinear, linear equations, solving equations

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Instructional Ideas

• Clarify that the Addition Postulate does not require the segments or the angles being added to be congruent

Classroom Considerations

• Assumes the class is familiar with solving linear equations
• Third installment of a six-part Topics in Geometry unit

• This video is hosted on YouTube

Pros

• Shows all the steps in the answer key
• Includes a video that walks through the solution method for the application problem

Cons

• None

Common Core

SL.9-10.2 SL.11-12.2 MP3 MP6 HSG-CO.C.9