Proof of some Triangle Formulae

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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°.

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

DOI: https://doi.org/10.1017/S1757748900001444 [Opens in a new window]

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Proof of some Triangle Formulae

Volume 18
A. G. Burgess
DOI: https://doi.org/10.1017/S1757748900001444

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Proof of some Triangle Formulae

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