$\"\"$

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The endpoints of a diameter at $\"\"$ .

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Mid point = $\"\"$ .

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Substitute $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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Find the radius,

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$\"\"$

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Substitute $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$ $\"\"$

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Evaluate powers: $\"\"$ .

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$\"\"$

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$\"\"$

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Power of $\"\"$ .

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$\"\"$

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$\"\"$

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The radius of the circle is $\"\"$ , So $\"\"$ . $\"\"$

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The equation of a circle with center $\"\"$ and radius r units is $\"\"$ . $\"\"$ (Substitute $\"\"$ )

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$\"\"$ (Product of two same signs is positive) $\"\"$

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