## Geometry and Discrete Math Links

Would anyone happen to have some links which briefly explain some of the laws in geometry and/or discrete math? At the moment, i am looking for a summary of the Properties of Circles .

Thank you for being as helpful as you always are.

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ps
I found MathWorld, although i can not find properties of circles section. link
 No one? bump!
 http://mathworld.wolfram.com/topics/Circles.html Hope that helps! :)

## Geometry and Discrete Math Links

What are some general rules regarding a tangent which lies on two points; these two points are each on a different (sized circle), and the two circles are overlapping each other (intersecting at two points).
 The only one I know of (though there may be more) is that the chord drawn from the two points of intersection of the circles bisects the common external tangent. Hope that helps! :)
 So if the two points of intersection are connected, and are extended to meet the common tangent, the tangent will be bisected?
 Yes, that's correct.