The internal angles in the loops can now be computed. The internal angles sum to a multiple of 180. The internal angles sum to something other then a multiple of 180. This loop contains at least 2 degrees of angle problems. In this specific case, we know that CDB is blundered, but only because of the way this data was contrived.
Some folk prefer positive angles.
For example they take -60 degrees as 300 degrees. An early reviewer of this complained that it wasn't obvious how to do a loop that wasn't a triangle. Since the outer loop also contains the blundered angle, it should come as no surprise that it also miscloses by 2 degrees. Note that each angle is just the next angle in the loop. It really doesn't matter which direction one goes around loops.