Friday, May 17, 2013

Find the polar coordinates (r, theta) for the point (-2,-9)

We convert: 

%0D%0Ar=sqrt%28x%5E2%2By%5E2%29=sqrt%28%28-2%29%5E2%2B%28-9%29%5E2%29=sqrt%2885%29%0D%0A 
%0D%0Atheta=arctan%28y%2Fx%29=arctan%28%28-9%29%2F%28-2%29%29=77.47 degrees 

:)
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