$\"\"$

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The eccentricity of a conic is $\"\"$ .

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Directrix of the conic is $\"\"$ .

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Consider directrix, $\"\"$ .

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The equation in standard form : $\"\"$ .

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Substitute $\"\"$ and $\"\"$ in standard form.

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$\"\"$

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Therefore, the polar equation is $\"\"$ .

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$\"\"$

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(1) Draw the coordinate plane.

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(2) Graph the polar equation is $\"\"$ .

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Graph :

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$\"\"$ .

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Observe the graph,

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The polar equation is a circle.

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$\"\"$

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The polar equation is $\"\"$ .

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The polar equation is a circle.

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Graph :

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$\"\"$ .