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# Geometry - Sin & Cos

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So I'm trying to find the measure of an interior angle on a triangle using the law of Sines & Law of Cosines. I'm given Triangle ABC and am told to find Angle C. The measure of Angle A is 97 degrees, the measure of Line AB is 9.1 yd, and the measure of line BC is 11 yd. It is not a right angle, and I can't figure out how to solve it. Would someone please try and help? I would be very grateful.
Guest Mar 22, 2012
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In order to find the measure of an interior angle using Sine, Cosine, and Tangent, you must use the inverse (sin -1 cos -1 tan -1) For this problem you have to use Tan -1 because the measurements they give you are the opposite and adjacent sides in relation to the angle they give you. What your equation should look like at first is this: tanX=11/9.1. You then isolate X and simplify. Your problem should look like this: X=tan -1(1.2) Then you plug this into your calculater. Hope I was helpful
teamSOHCAHTOA  Mar 22, 2012
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8m*18m
Guest Mar 25, 2012

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