Arch


 * Arch**

__Notes from the oral presentation:__ Definition: Curved structure located between two intermediate supports; it can resist more compression force than the lintel and allows the use of bigger spans.

Shapes: semicircular (Roman), segmental (less than half a circle), or pointed (Gothic).

Parts:
 * 1)  Keystone
 * 2) Voussoir
 * 3) Back
 * 4) Impost
 * 5) Intrados
 * 6) Rise
 * 7) Clear span, "Bay"
 * 8) Abutment

Types:
 * Circular arches from a single center.
 * Circular arches of more than one center.
 * Non-circular arches of two centers.