Question 301458
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I have to presume (because you didn't specify) that O stands for the Opposite Side and A stands for the Adjacent Side.


On that basis, remember that the tangent function is defined as the ratio of the opposite side to the adjacent side, hence:


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ \tan\theta\ =\ \frac{9}{15}\ =\ \frac{3}{5}]


You can go find your own table of trig values but the calculator says:


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ \theta\ =\ \tan^{-1}\left(\frac{3}{5}\right)\ \approx\ 31] degrees.



John
*[tex \LARGE e^{i\pi} + 1 = 0]
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