| Angle of a bastion, | - | |
| Flanked angle, |
that which is made by the two faces, being the outermost part of the bastion, most exposed to the enemy’s batteries, frequently called the saliant angle, or point of the bastion.
Angle of the polygon, is made by the concourse of two adjacent sides of a polygon, in the centre of the bastion.
Angle of the triangle, is half the angle of the polygon.
| Angle of the shoulder, | - | |
| Angle of the epaule, |
is made by the face and flank of the bastion.
| Angle of the flank, | - | |
| Angle of the curtain |
that which is made by, and contained between the curtain and the flank.
| Angle of the tenaille, | - | |
| Flanking angle, |
made by two lines fichant, that is, the face of the two bastions extended till they meet in an angle towards the curtain, and is that which always carries its point towards the work.