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
steps.
STATEMENT 
JUSTIFICATION 
A circle has center (h,k), radius r,
and any point on the circle is given by (x,y). 
Given

