This video covers the vocab of how to name triangles based on the length of the sides.
Scalene, Isosceles, and Equilateral Triangles
This video covers the vocab above, and it also shows you a few of the key thoughts that should go through your mind every time you see an equilateral or isosceles triangle. "Congruent right triangles" anyone?
Triangle Side Length Questions (SAT)
This is a type of problem that I didn't know what to call or where to put, yet it shows up in every geometry book and (most importantly) standardized tests. It's the problem type where they give you three numbers -- say 3,4,9 -- and ask you if those could be the sides of a triangle. Not sure why those particular three numbers don't work?
If you do not have an account, you should get one, because it is awesome! You can save a playlist for each test or each chapter, and save your "greatest hits" into a "watch right before the final" list (not that we recommend cramming, but when in Rome...)