In this lesson we used protractors to measure the three angles inside of various triangles. We added up our results and conjectured that the sum of the interior angles of a triangle is 180 degrees.
We created our first triangle theorem:
Triangle Theorem 1: The sum of the interior angles of a triangle is 180 degrees.
For Extra Practice and Explanation: http://www.regentsprep.org/Regents/math/geometry/GP5/LIntAng.htm
For a Challenge follow along with this video: http://www.youtube.com/watch?v=OPG-9IFnJnI
Attached below are the classwork and homework assignments for Topic 1.