Videos
https://www.youtube.com/watch?v=h7ZAQfNh8XA
https://study.com/academy/lesson/congruent-and-similar-shapes.html
https://www.youtube.com/watch?v=3DIqvNjChpY
https://tutors.com/math-tutors/geometry-help/similar-triangles
Practice Activities & Worksheets
https://mathbitsnotebook.com/Geometry/Similarity/SMProofs.html
https://popehs.typepad.com/files/kuta-proving-triangles-similar-ws-extra-practice-key-1.pdf