$\"\"$

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The polar equation is $\"\"$ .

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Transform the equation to rectanglular coordinates :

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$\"\"$

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Multiply on each side by $\"\"$ .

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$\"\"$

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Substitute $\"r$ and $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ .

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The equation $\"\"$ is in the form of standard circle equation

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$\"\"$ with center $\"\"$ and radius $\"\"$ .

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$\"\"$

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The polar equation is $\"\"$ , $\"\"$ is a circle with radius $\"\"$ and center $\"\"$ in rectangular coordinates.