Math Links for Geometry (Triangles and angles)

Math is fun - definitions of different  angles, triangles and their properties:
https://www.mathsisfun.com/angles.html
https://www.mathsisfun.com/triangle.html

Online geo board for creating different triangles
https://apps.mathlearningcenter.org/geoboard/

Online protractor for measuring different angles.
https://www.visnos.com/demos/basic-angles


What are Congruent shapes? 
https://www.youtube.com/watch?v=86iU3fypTd4

Similar vs Congruent
https://www.youtube.com/watch?v=h7ZAQfNh8XA