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Contributed by American Museum of Natural History Library.
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Transcription
A
B
c
a
b
c
\n\n\na/c = sin A \\therefore a = c \sin A
\nb/c = cos A \\therefore b = c \cos A
\n\na/c = sin A\\qquad c = \frac{a}{\sin A}
\na/b = tan A\\therefore a = b \tan A
\nb/a = cot A\\therefore b = a \cot A
\nb/c = cos A
\\therefore b = c \cos A\\qquad \therefore c = \frac{b}{\cos A}