Using transformations to prove triangle sum thm Forums Main Page › Forums Main Page › Geometry › Triangles › Angle Measures of Triangles › Using transformations to prove triangle sum thm This topic has 0 replies, 1 voice, and was last updated 10 years, 4 months ago by Sharma. Viewing 0 reply threads Author Posts July 10, 2014 at 2:13 am #2266 SharmaKeymaster The lesson attached is a lesson worksheet that challenges students to use transformations to prove the triangle sum theorem Attachments: Transformations_to_Prove_Triangle_Sum.doc Author Posts Viewing 0 reply threads You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In