How to find theta in a triangle

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Solving for an angle with the law of sines

!In the diagram, the adjacent side is a and the hypotenuse is c, so costheta=a/c. To find theta, you use the arccos function, which has the same relationship to cosine as arcsin has to sine. And again, you may see arccos
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How to Find Angle Theta in Trigonometry

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