Miscellaneous sketches
I used this one to teach similarity in right triangles with an altitude. (for fun, show everything that is hidden just to see how disorganized i was making the sketch)
This one shows the relationship between arcs when two lines intersect outside of a circle, inside of a circle, and on a circle (hence the name)
These are sketches that come with some books i have (misplaces currently) with lesson plans for common core algebra I and II and Geometry.
Here is a sketch that works for students who are out to study the centers of a Triangle (bonus Napolean's Theorem at the end).