Question

What is the general form of the equation of a circle with its center at (-2, 1) and passing through (-4, 1)?

Answer 1

General form of a equation of a circle when its center is not at the origin is (x-k)^2 + (y-h)^2 = r^2. Center (k, h).

The radius from the center to some point on the circle is given by the distance formula\[D=\sqrt{(x-k)^{2}+(y-h)^{2}}\]