SOLUTION: an angle measured in standard position has the point (4,-5) on its terminal ray. What is cos theta?

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Question 886701: an angle measured in standard position has the point (4,-5) on its terminal ray. What is cos theta?
Answer by lwsshak3(11628) About Me  (Show Source):
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an angle measured in standard position has the point (4,-5) on its terminal ray. What is cos theta?
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hypotenuse of reference right triangle in quadrant IV=√(4^2+5^2)=√(16+25)=√41
cos theta=4/√41=4√41/41