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Proof of some Triangle Formulae

Published online by Cambridge University Press:  31 October 2008

A. G. Burgess
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Let I be the incentre of ΔABC, and let the excentre opposite A be I1 Draw perpendiculars IF and I1F1 to AB. IBI1 = 90°.

Type
Research Article
Information
Edinburgh Mathematical Notes , Volume 18 , May 1915 , pp. 202 - 206
Copyright
Copyright © Edinburgh Mathematical Society 1915