1)

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The standard form of circle equation is

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$\"\"$

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Find the radius.

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Observe the graph,

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The center and radius of the circle $\"\"$

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The radius is $\"\"$

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2)

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Find the circle equation.

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Observe the graph,

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The center and radius of the circle $\"\"$

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Substitute $\"\"$ in $\"\"$

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$\"\"$

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The equation of the circle is $\"\"$

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3)

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Find the circle equation.

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Observe the graph,

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The center and radius of the circle $\"\"$

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Substitute $\"\"$ in $\"\"$

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$\"\"$

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The equation of the circle is $\"\"$