import math


def ang_threep(a,b,c):
    """
    Measures the angle formed by three points. The angle goes from 0 to 360. 
    Point 'a' it's the anchord, and the measured angle it's the one that goes from 'b' to 'c' clockwise.
    """
    ang = math.degrees(math.atan2(b[1]-a[1], b[0]-a[0]) - math.atan2(c[1]-a[1], c[0]-a[0]))
    return ang + 360 if ang < 0 else ang