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I am attempting to calculate the position of a point after it has been rotated

I have been using an algorithm but I am getting incorrect values which makes me think I am using the incorrect algorithm or incorrect values.

What algorithm and values should I use to find the position of the green dot? enter image description here

My calculation is here:

x  = -6  y  = 349 0  = -25  x' = x*cos(0) - y*sin(0) y' = x*sin(0) + y*cos(0)  x' = (-5.44) - (-147.49) y' = (2.54) + (316.30)  x' = 142.05 y' = 318.84 // Isn't that really wrong shdn't it be around 0,349 for the answer? 

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