SOLUTION: (-3,3) is on the terminal side of theta, what is the cosine of theta

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Question 750761: (-3,3) is on the terminal side of theta, what is the cosine of theta
Answer by lwsshak3(11628) About Me  (Show Source):
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(-3,3) is on the terminal side of theta, what is the cosine of theta.
reference angle in quadrant II
hypotenuse of reference right triangle=√(3^2+3^2)=√18=3√2
cos theta=-3/(3√2)=-√2