Ptolemy's Theorem and certain Trigonometrical Formulæ

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Let XOX′ = 1 be the diameter of a circle,

Then the lines representing the sines and cosines of the angles,

are marked in the figure.

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Type: Research Article
Information: Edinburgh Mathematical Notes , Volume 4 , April 1910 , pp. 42 - 43

DOI: https://doi.org/10.1017/S1757748900000633 [Opens in a new window]

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Ptolemy's Theorem and certain Trigonometrical Formulæ

Volume 4
A. G. Burgess
DOI: https://doi.org/10.1017/S1757748900000633

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Ptolemy's Theorem and certain Trigonometrical Formulæ

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