
[HM] Theorem of tangents
Posted:
Mar 27, 2001 11:59 AM


I'm interested in finding a reference in English to the origin and use of the theorem of tangents:
(ab)/(a+b) = tan (AB)/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

