from math import sqrt

def get_distance(first_coord, second_coord):
    """
    Get the distance between two points in the cartesian plane.

    Parameters
    ----------

    first_coord: tuple
        Position x and y of first point.

    second_coord: tuple
        Position x and y of second point.

    Returns
    -------

    The distance.
    """

    x1, y1 = first_coord
    x2, y2 = second_coord

    distance = sqrt((y2-y1)**2 + (x2-x1)**2)

    return distance

def avg_distance(first_coord, second_coord, third_coord):
    """
    Get the average distance between three points.

    Parameters
    ----------

    first_coord: tuple
        Position x and y of first point.

    second_coord: tuple
        Position x and y of second point.

    third_coord: tuple
        Position x and y of second point.

    Returns
    -------

    The average distance.
    """

    # Get distances
    dist_1 = get_distance(first_coord, second_cord)
    dist_2 = get_distance(first_coord, third_cord)
    dist_3 = get_distance(second_coord, third_cord)

    avg = (dist_1 + dist_2 + dist_3)/3

    return avg