def right_triangle(a, b):
  return (b - (b - a)*0.186)

def left_triangle(a, b):
  return (a + (b - a)*0.186)

def choise_triangle_func(a, b, c):
    if b == c:
        return right_triangle(a, c)
    if b == a:
        return left_triangle(a, c)