Pisiffik pissartanngornera A, B, C kissaat.
A = -2, 3
B = 1, -1
C = 4, 0
Aamma takorna tikittunersaannik nipilersorneq, BA, BC-imik nuanneqartut, inuttat A, B, C nunatsinni inuitarneqarsimaffiat. 
A = (-2, 3), B = (1, -1), C = (4, 0)
BA = <-3, 4>, BC = <3, 1>
BA ∙ BC = (-3)(3) + (4)(1) = -5
|BA| = 5, |BC| = sqrt(10)
θ = acos((-5)/(5*sqrt(10))) = 1,76 radiiani, 101 gradiataat.