One mode of measuring the facial angle in projection is that of drawing the facial profile with the help of special instruments; or else of taking a photograph in perfect profile and tracing and measuring the facial angle on the picture.
Principal Linear Measurements:
Total length of visage: from line of hair root to point of chin.
Total length of face: from the nasion to the point of the chin.
Length of the nose: from the nasion to the subnasal point.
Height of mandible: from the upper edge of the lower incisors to the lower edge of mandible.
Subnase-mental height: from the subnasal point to the point of the chin.
Bizygomatic diameter: between the two bizygomatic arches.
Bimalar diameter: between the two malar points.
Bigoniac diameter: between the two gonia.