finding angle between three points on a 2d graph

[qrani]

here is what i have so far:

import math
p1x = 0
p1y = 5
p2x = 0
p2y = 0
p3x = 5
p3y = 0
angle1 = (math.atan2(p3y - p1y, p3x - p1x) - math.atan2(p2y - p1y, p2x - p1x))
print(angle1)

based on something i found online, but not sure if it is correct, also it just gives
0.785(irrational) and i want a 0-360 number.
edit: i changed it to deg with math.degrees,
but still doesn't work to my full intentions
and gives me 45 deg when its 90 deg