The radius of the circle $r=\sqrt{3} \sin \theta+\cos \theta$ is

The radius of the circle $r=\sqrt{3} \sin \theta+\cos \theta$ is
  1. $1$
  2. $2$
  3. $3$
  4. $4$

Solution

Given equation of circle is $ r=\sqrt{3} \sin \theta+\cos \theta $ On putting $x=r \sin \theta, y=r \sin \theta$ $ \begin{array}{lc} \therefore & r=\sqrt{3} \frac{x}{r}+\frac{y}{r} \\ \Rightarrow & r^2=\sqrt{3} x+y \\ \Rightarrow & x^2+y^2-\sqrt{3} x-y=0 \\ \therefore \text { Radius }=\sqrt{g^2+f^2-c} \\ & =\sqrt{\left(\frac{\sqrt{3}}{2}\right)^2+\left(\frac{1}{2}\right)^2}=\sqrt{\frac{4}{4}}=1 \end{array} $

Asked in: AP EAMCET 2004

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