This quality parameter applies to tetra, hexa, quad, and tri elements.

Element equiangle skew = 1.0 – max ((Q_max – Q_e) / (180 – Q_e), (Q_e – Q_min) / Q_e),

where

Q_max = largest angle in the face or element

Q_min = smallest angle in the face or element

Q_e = angle of an equiangular face or element (60 degrees for a triangle or 90 degrees for a square).