My Math Forum Solve for the measure of an angle

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 May 15th, 2018, 02:15 PM #1 Senior Member   Joined: Jan 2017 From: US Posts: 113 Thanks: 6 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?
 May 15th, 2018, 02:55 PM #2 Math Team   Joined: Jul 2011 From: Texas Posts: 2,774 Thanks: 1428 cosine law ... $a^2=b^2+c^2-2bc\cos{A} \implies m\angle{A} = \arccos\left(\dfrac{b^2+c^2-a^2}{2bc}\right)$ Thanks from Country Boy and Indigo28

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