code: def get_SSE(a,b,r,x,y):
      
      SSE = 0
      X = numpy.array(x)
      Y = numpy.array(y)
      for i in range(len(X)):
          x = X[i]
          y = Y[i]
          v = (numpy.sqrt( (x -a)**2 + (y - b)**2 ) - r )**2
          SSE += v
      return SSE
docs: input: a, b, r, x, y.  circle center, radius, xpts, ypts
      output: SSE