Question 955201
{{{drawing(300,300,-6,6,-6,6,grid(1),circle(3,-4,0.25),blue(line(0,0,3,-4)))}}}
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{{{A=sqrt(3^2+(-4)^2)=sqrt(9+16)=sqrt(25)=5}}}
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{{{B=C=tan^(-1)(-4/3)=306.9}}}