What would cos\theta be if angle theta passes (-4, 3)?

Im honestly not quite sure what to do here. or:I'm honestly not quite sure what to do here.or:Trigonometry is based on a picture of a circle with the

I'm honestly not quite sure what to do here.

or:I'm honestly not quite sure what to do here.

or:Trigonometry is based on a picture of a circle with the radius making an angle with the x axis. You carry this picture in your head, not your calculator. Trig is mostly imagination and the rest memorization.Remember Chief SohCahToaSin = Opposite/HypotenuseCosine = Adjacent/HypotenuseTangent = Opposite/AdjacentAlso memorize:Sec = 1/CosCsc = 1/SinCot = 1/TanThe radius is 1 unless otherwise specified. Getting to (-4, 3) makes the angle greater than 90 degrees. The opposite side is the vertical and that is 3. The adjacent side is horizontal and that is -4. So the cosine of the angle is -4/3.BTW the radius in this case is not 1, it is 5.

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