I already made an article for all of these tasks

If two triangles are congruent, it means that they both have the same angle on every vertex. It also means they both have the same lenth of all of their sides. It doesn't matter if one traingle is mirrored relative to the other one. The fifth screenshot will show the tasks given on Khan Academy. The rest of the tasks all ready have their own article. The are all labeled "math" to help you find them. The other tasks are, geometric tranlations, geometric rotations and, the pythagorean theorem.