input: Write a python function to check if a point is inside a given circle.
  assert isInsideCircle((2,2), (0,0), 5)==True
  assert isInsideCircle((6,6), (0,0), 5)==False
  assert isInsideCircle((3,3), (3,3), 1)==True
output: def isInsideCircle(point, center, radius):
      x, y = point
      cx, cy = center
      distance = ((x - cx) ** 2 + (y - cy) ** 2) ** 0.5
      return distance <= radius