Geometry and Discrete Math Links

[dekoi]

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. :confused: link (http://mathworld.wolfram.com/topics/Geometry.html)

[dekoi]

No one?

bump!

[nolachrymose]

http://mathworld.wolfram.com/topics/Circles.html

Hope that helps! :)

[dekoi]

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).

[nolachrymose]

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! :)

[dekoi]

So if the two points of intersection are connected, and are extended to meet the common tangent, the tangent will be bisected?

[nolachrymose]

Yes, that's correct.