Step 1:

The standard form of the circle equation with center at the origin is $\"\"$ .

Where r is the radius of the circle.

The distance between the point $\"\"$ and the origin is equal to the radius of the circle.

Radius:

$\"\"$

Step 2:

Substitute the value $\"\"$ in $\"\"$ .

$\"\"$

Solution :

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