6. Equilateral pointed arches, described from two centres, the radius being the whole width of the arch.
7. Drop arches, with centres within the arch.
8. Lancet arches, with centres outside the arch.
9. Three centre arches, employed in French Flamboyant.
10. Four centre arches, employed in the Perpendicular and Tudor periods.
11. Ogee arches, with curves of counter flexure, found in English Decorated and French Flamboyant.
12. Pointed horseshoe arches, found in the mosque of Tulun, Cairo, 9th century.
13. Pointed foiled arches, in the arcades of Beverley Minster (c. 1230) and Netley Abbey.
14. Cusped arch; Christchurch Priory, Hants.
15. Multifoil cusped arch, invented by the Moors at Cordova in the 10th century.