How is Arc Created

I want to understand the mathematics of Arc Method. I read documentation but still have not got it :( ... Can some one explain me the how arc is created from the Ellipse and rectangles . I shall be very thankful to you.
[220 byte] By [UnKnownNick] at [2007-12-16]
# 1
The below topic might help:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/gdicpp/GDIPlus/aboutGDIPlus/linescurvesandshapes/ellipsesandarcs.asp

It has some graphical explanation that might help you visualize the concept.

Thanks,
Ayman Shoukry
VC++

AymanShoukry at 2007-9-9 > top of Msdn Tech,Visual C++,Visual C++ General...