Khan Academy on a Stick
Language and notation of the circle
Formal definition of a circle. Tangent and secant lines. Diameters and radii. major and minor arcs
If the above player doesn't work, try this direct link.
Formal definition of a circle. Tangent and secant lines. Diameters and radii. major and minor arcs
If the above player doesn't work, try this direct link.