Which relationship is always correct for the angles m, n, and p of triangle ABC? (1 point)
A triangle ABC has angle ABC labeled as n, angle BCA labeled as p, and the exterior angle at A labeled as m.
n + p = m
m + p = n
m + p + n = 180 degrees
m + p + n = 90 degrees
The correct relationship for the angles m, n, and p of triangle ABC is that the sum of the angles is always equal to 180 degrees. Therefore, the correct option is:
m + p + n = 180 degrees