if the line px +qy+r=0 touches the circle x^2 +y^2=a^2 then show that – InterviewSolution

1.	if the line px +qy+r=0 touches the circle x^2 +y^2=a^2 then show that r^{2 }=a^2(p^2+q^2).
Answer» if the line px +qy+r=0 touches the circle x^2 +y^2=a^2 then show that r^{2 }=a^2(p^2+q^2).

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