Click on the links below to learn more about classifying triangles by their angles and by their sides and how to calculate a missing third angle:
Triangles Classified by Their Sides:
Link #1-AAAMath (interactive with score results)
Triangles Classified by Their Angles:
Link #1-AAAMath (interactive with score results)
Link #2-Math-Play Game
Both:
Link #1-Brainpop-Video
Link #2-FactMonster-Game