Here is link to IXL's website Geometry.
Here is a video on ACT circles. It is about 16 minutes in length.
Here is a video that will make the Pythagorean theorem make sense! Watch
Here is a video on how to find vertical, horizontal, and oblique asympote(s).
Here is a video to explain horizontal asympote(s). It is less than 5 minutes.
Here is a video that is specific to the properties of triangles.
Here is a link that goes over Unit Circle.