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### Instructions and Help about Which Form 2220 Determining

All right in this video we're going to do an example of finding an angle the measure of an angle if we know a little more information so in this case suppose we know the cosine of theta is equal to square root of 3 over 2 we want to find the angle what the measure is for angle here theta so remember cosine of an angle is defined to be the adjacent side over the hypotenuse and again for our angle theta this would be the adjacent so I'm simply going to label the adjacent side as square root of 3 I'm going to label the hypotenuse here with length 2 and now we would have to figure out you know this missing side you may know this you know if you from geometry but we can always figure it out just using Pythagorean theorem so we'll take the square root of 3 squared plus this missing side we'll call it B squared that equals 2 squared well the square root of 3 squared is just going to be 3 plus B squared 2 squared is going to give us 4 and now if we subtract 3 from both sides we'll just get that B squared equals 1 and when we take the square root we'll get positive negative 1 but again it's got to be the positive one because we're talking about a length here so this simply has a length of 1 so again what we're trying to do is we're trying to figure out our our angle theta so now we have to be a little bit clever here and what we're going to do is I'm going to kind of take this triangle and I'm going to reflect it okay so we've got our triangle...