\( \frac{\mathrm{x}-\mathrm{x}_{1}}{\cos \theta}=\frac{\mathrm{y}-\...

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\( \frac{\mathrm{x}-\mathrm{x}_{1}}{\cos \theta}=\frac{\mathrm{y}-\mathrm{y}_{1}}{\sin \theta}=\mathrm{r} \), represents
\( \mathrm{P} \)
(A) equation of a straight line, if \( \theta \) is constant and \( \mathrm{r} \) is variable
W
(B) equation of a circle, if \( r \) is constant and \( \theta \) is a variable
(C) a straight line passing through a fixed point and having a known slope
(D) a circle with a known centre and a given radius.
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