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May 15th, 2018, 02:15 PM   #1
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Solve for the measure of an angle

A triangular fence is built with sides of length 15 m, 14 m, and 25 m, respectively. To the nearest degree, solve for the measure of the angle of the fence between the two smallest sides. State which trigonometric law you used and show your work. Round your answer to the nearest hundredth.


Could anyone point me in the right direction as far as which trigonometric law I should use?
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May 15th, 2018, 02:55 PM   #2
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cosine law ...

$a^2=b^2+c^2-2bc\cos{A} \implies m\angle{A} = \arccos\left(\dfrac{b^2+c^2-a^2}{2bc}\right)$
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