Vocabulary
https://www.mathplayground.com/measuringangles.html
https://www.mathplayground.com/alienangles.html
http://www.sciencekids.co.nz/gamesactivities/math/angles.html
https://www.mathgames.com/skill/4.3-parallel-perpendicular-intersecting
https://www.mathsisfun.com/perpendicular-parallel.html