The included angle is the sum of the edge angles.

The edge angle is measured between the surface of an edge and a line running from the point of the cutting edge to the back edge.

The basal field and inner edge angle of the hindwing upperside are extended, dark brown and scarcely lightened.

If radius of a turn is chosen together with edge angle, calculation of sidecut (intersection of snow and ski surface) was relatively easy.

The use of wider boards to accommodate extreme edge angles (the angle between board base and snow surface) produced deep in turns.

Typical edge angles are about 20 (making the included angle 40 on a double-ground edge).

The edge angle for very sharp knives can be as little as 10 degrees (for a 20 included angle).

The first thing you need to do is become aware of how much you are edging - and then to turn with reduced or very little edge angle.

Chisel grind - As on a chisel, only one side is ground (often at an edge angle of about 20 - 30 ); the other remains flat.

A chisel grind has only a single edge angle.