def triangle_area(point1, point2, point3):
    """
    Find the area of a 2D triangle specified by 3 points.
    :param point1:
    :param point2:
    :param point3:
    :return:
    """
    return abs(0.5 * (
            point1[0] * (point2[1] - point3[1]) +
            point2[0] * (point3[1] - point1[1]) +
            point3[0] * (point1[1] - point2[1])
    ))