$\"\"$

Center $\"\"$ , radius (r) $\"\"$ units.

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

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

$\"\"$ (Evaluate powers: $\"\"$ ) $\"\"$

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