Elementary Graphing Exercise 2 - Graphs of Circles
Derive the circle formula (x - h)2 + (y - k)2
= r 2 for the circle with center (h, k) and
radius = r by using the Definition of a Circle and the
Distance Formula, and performing other algebraic steps. Justify all
|A circle has center (h,k), radius r,
and any point on the circle is given by (x,y).