Geometrical Proof of tan A + tan B + tan C = tan A tan B tan C

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Let ABC be the Δ, AD and BE ⊥s to BC and AC, CK and BM ⊥s to ED.

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Type: Research Article
Information: Edinburgh Mathematical Notes , Volume 19 , December 1915 , pp. 211 - 212

DOI: https://doi.org/10.1017/S1757748900001481 [Opens in a new window]

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Geometrical Proof of tan A + tan B + tan C = tan A tan B tan C

Volume 19
A. G. Burgess
DOI: https://doi.org/10.1017/S1757748900001481

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Geometrical Proof of tan A + tan B + tan C = tan A tan B tan C

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