Angle theorems reference page

I found a neat reference page about the important angle theorems, with visuals AND interactive versions:

Includes for example such basics as angles around a point add up to 360 degrees; vertical angles are equal; corresponding angles are equal; and results about the angle sum of a triangle, a quadrilateral, polygons; plus a few more.

Go check it out! I feel not only teachers, but students also might enjoy browsing through the page.