text: 2014-08-06T14:38:21-04:00
  Equation of a circles is given as
  (x - xc )²  + ( y - yc )²  =  r²
  center is (xc, yc)   radius is r  origin is (0,0)
  since center is at the origin  xc = 0  yc = 0
  circle is x² + y² = r²
  radius of the circle is the distance between the point (4, 1) and (0,0) origin.
  distance is    √ [ (4-0)² + (1-0)²  ]    = √17
  equation is  x² + y² = 17
  
  2014-08-06T14:41:26-04:00
  Center of the circle is at the point (0, 0).
  Circle passes through (4,1), so radius is r:
  a=4, b = 1
  
  Equation of circle:
  (canonical form)
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