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We will learn the Third Angle Theorem. If 2 angles of one triangle are congruent to 2 angles of another triangle, then the third angle of the first triangle must also be congruent to the 3rd angle of the other triangle.

Previous video in this series on YouTube:    • Geometry - Ch. 5: Triangle (14 of TBD...  
Title: Geometry - Ch. 5: Triangle (14 of TBD) Congruent Figures Examples

Next video in this series on YouTube:    • Geometry - Ch. 5: Triangle (16 of TBD...  
Title: Geometry - Ch. 5: Triangle (16 of TBD) Third Angle Theorem Example