Triangle Sum Theorem & Exterior Angles Theorem

Presentation 

https://www.tamdistrict.org/cms/lib/CA01000875/Centricity/Domain/386/ext%20angle%20thm%20practice%20triangle%20sum%20practice.pdf

Videos

https://www.youtube.com/watch?v=Qf0gbch5Brk 

https://www.youtube.com/watch?v=eoe8bpowBK4 

https://www.youtube.com/watch?v=YS2K2SpvVIA 

https://www.youtube.com/watch?v=ndqxxAUDF5Y 

Practice Activities & Worksheets

https://www.storyofmathematics.com/triangle-sum-theorem 

https://www.paulding.k12.ga.us/cms/lib010/GA01903603/Centricity/Domain/2010/9-10-15%20-%20Unit%201-%20Work%20Period%20-%20Triangle%20Sum%20Theorem%20-%20PDF.pdf 

https://www.mathsisfun.com/geometry/triangle-exterior-angle-theorem.html 

https://www.storyofmathematics.com/exterior-angle-theorem 

https://www.tamdistrict.org/cms/lib/CA01000875/Centricity/Domain/386/ext%20angle%20thm%20practice%20triangle%20sum%20practice.pdf