
In the figure above is the chord of the circle, is the arc length , is the
radius, is the central angle determined by the chord , is the distance from the chord to the circle
and is the distance from the center of the circle to the
chord. The following relationships hold: ,
,
and .
From these we get
(1) 
(2) 
(3) 
(4) 
Is that surprising, or not?
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Copyright © 1993, 1994, 1995, 1996,
Nikos Drakos,
Computer Based Learning Unit, University of Leeds.
Copyright © 1997, 1998, 1999,
Ross Moore,
Mathematics Department, Macquarie University, Sydney.
The translation was initiated by Bill Richardson on 20070418