That which is made by, and contained between the curtain and the flank.
Angle of the polygon, that which is made by the meeting of the two sides of the polygon, or figure in the centre of the bastion. See [Fortification].
Angle of the triangle, is half the angle of the polygon.
| Angle of the bastion, or | - | |
| Flanked Angle, |
That which is made by the two faces, being the utmost part of the bastion most exposed to the enemy’s batteries, frequently called the point of the bastion. See [Fortification].
Diminished Angle, only used by some engineers, especially the Dutch, is composed of the face of the bastion, and the exterior side of the polygon.
| Angle of the shoulder, or | - | |
| Angle of the épaule, |
Is formed by one face, and one flank of the bastion. See [Fortification].
| Angle of the tenaille, | - | |
| Angle rentrant, |
Is made by two lines fichant, that is, the faces of the two bastions extended till they meet in an angle towards the curtain, and is that which always carries its point towards the out-works. See [Fortification].