## FANDOM

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Theta ($\theta$) is a symbol used to denote the unknown measure of an angle.

It is used mostly in displaying the trigonometric ratios of sine, cosine, and tangent. For example:

$\sin\theta=\frac{\mbox{opp}}{\mbox{hyp}}$
$\cos\theta=\frac{\mbox{adj}}{\mbox{hyp}}$
$\tan\theta=\frac{\mbox{opp}}{\mbox{adj}}$