Triangle Angles Add Up to 180
Grade 445 min
aligned to 5.mg.3 The Student Will Classify And Measure Angles And Triangles, And Solve Problems, Including Those In Context.
Learning Objective
I can prove that the angles inside a triangle add up to 180° using models and find a missing angle in a triangle.
Lesson Flow
Watch Video
Proof: Sum of measures of angles in a triangle are 180 | Geometry | Khan Academy
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Practice
7 questions • Short answer
Exit Ticket
“A triangle has angles measuring 60° and 75°. What is the measure of the third angle? A triangle has angles measuring 90° and 20°. What is the measure of the third angle? ”
Teacher Guide
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- Answer keys for all questions
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