Angle Side / Base-Angle Theorem - Two Column Proofs

This geometry video tutorial explains how to use the angle side theorem also known as the base-angle theorem in two column proofs. The angle side theorem states that if two sides of a triangle are congruent, the angles are congruent and vice versa. This theorem typically applies to an isosceles triangle. This video contains plenty of geometry practice problems that include solving equations with x and inequalities with restrictions on x. 2 Column Proofs of Congruent Segments: https://www.youtube.com/watch?v=cboityRIf4Q 2 Column Proofs of Angles: https://www.youtube.com/watch?v=kXcG6oYh3i8 Triangle Congruence - SSS, SAS, ASA: https://www.youtube.com/watch?v=jWHOF6cFbpw CPCTC - 2 Column Proofs With Triangles: https://www.youtube.com/watch?v=eq1frp_ZyP8 Median of a Triangle Formula: https://www.youtube.com/watch?v=_JdkDR4R8E4 Altitude of a Triangle - Orthocenter: https://www.youtube.com/watch?v=oJyTKVcE4iM _____________________________________ Triangles, Medians, & Altitudes - Proofs: https://www.youtube.com/watch?v=ZJ_gqFidInk 2 Column Proofs - Isosceles Triangles: https://www.youtube.com/watch?v=6Yx923Ocoh4 Hypotenuse Leg Theorem - HL Postulate: https://www.youtube.com/watch?v=DKSTjS0n3mY Detour Proofs - Double Triangle Congruence: https://www.youtube.com/watch?v=1HOrB5yvEl0 Missing Diagrams - 2 Column Proofs: https://www.youtube.com/watch?v=IaqzuGweGZ8 _______________________________________ Final Exams and Video Playlists: https://www.video-tutor.net/ Full-Length Videos and Worksheets: https://www.patreon.com/MathScienceTutor/collections