End METRIC.
Section ANGLES.
Parameter AS : Set.
Parameter Angle : Point -> Point -> Point  -> AS.

Axiom CongruentSSS : forall A B C D E F : Point,
A <> B ->
A <> C ->
Distance A B = Distance D E ->
Distance A C = Distance D F ->
Distance B C = Distance E F ->
Angle B A C = Angle E D F.