About This Lesson
A visual proof of why the angles in a triangle sum to 180 degrees. Aligned to Common Core State Standard: 7.G.2
Resources
Standards
Draw (freehand, with ruler and protractor, and with technology) geometric shapes with given conditions. Focus on constructing triangles from three measures of angles or sides, noticing when the conditions determine a unique triangle, more than one triangle, or no triangle.
Advertisement
Very nice, simple animated visual that you could talk and engage the class in to prove that interior angles of a triangle add up to 180 degrees.