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Topic: [HM] Theorem of tangents
Replies: 5   Last Post: Mar 28, 2001 4:57 PM

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Francine F. Abeles

Posts: 1
Registered: 12/3/04
[HM] Theorem of tangents
Posted: Mar 27, 2001 11:59 AM
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I'm interested in finding a reference in English to the origin and use of
the theorem of tangents:

(a-b)/(a+b) = tan (A-B)/2 x tan C/2, where a,b are the sides of a
triangle; A,B,C are its angles.

Fran Abeles
Department of Mathematics & Computer Science
Kean University
Union, NJ 07083
Tel. 908 527 2493
Fax. 908 527 3168

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