Return distance between the centers
def dis ( x1 , y1 , x2 , y2 ) : NEW_LINE INDENT return sqrt ( ( x1 - x2 ) * ( x1 - x2 ) + ( y1 - y2 ) * ( y1 - y2 ) ) NEW_LINE DEDENT def check ( c1 , c2 , k ) : NEW_LINE INDENT min = 0 NEW_LINE max = 0 NEW_LINE DEDENT