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A building's surface detailing, inside and outside, often includes decorative moulding, and these often contain ogee-shaped profiles—consisting (from low to high) of a concave arc flowing into a convex arc, with vertical ends; if the lower curve is convex and higher one concave, this is known as a Roman ogee, although frequently the terms are used interchangeably and for a variety of other ...
An outdoor fireplace is a place for building fires outside of the home. Similar in construction to an indoor fireplace, an outdoor fireplace is usually added to a stone, brick, or concrete patio. It often consists of a firebox and a chimney. The firebox is typically constructed with a smoke shelve incorporated although straight firebox designs ...
The ovolo or echinus is a convex decorative molding profile used in architectural ornamentation. Its profile is a quarter to a half of a more or less flattened circle. The 1911 edition of Encyclopædia Britannica says: adapted from Ital. uovolo, diminutive of uovo, an egg; other foreign equivalents are Fr. ove, échine, quart de rond; Lat ...
A formalized lintel, the lowest member of the classical entablature. Also the moulded frame of a door or window (often borrowing the profile of a classical architrave). Area or basement area In Georgian architecture, the small paved yard giving entry, via "area steps", to the basement floor at the front of a terraced house. Arris
If every internal angle of a simple polygon is less than a straight angle (π radians or 180°), then the polygon is called convex. In contrast, an external angle (also called a turning angle or exterior angle) is an angle formed by one side of a simple polygon and a line extended from an adjacent side. [1]: pp. 261–264
In some areas of mathematics, such as polyhedral combinatorics, a polytope is by definition convex. Formally, a face of a polytope P is the intersection of P with any closed halfspace whose boundary is disjoint from the interior of P. [7] From this definition it follows that the set of faces of a polytope includes the polytope itself and the ...
Alternating convex and concave flutes on the two nearest piers. In Byzantine architecture columns were mostly relatively small and functional rather than decorative. They were used to support galleries, ciboriums over altars and the like. Byzantine taste appreciated rare and expensive types of stone, and like to see these in round and polished ...
A regular octahedron is convex, meaning that for any two points within it, the line segment connecting them lies entirely within it. It is one of the eight convex deltahedra because all of the faces are equilateral triangles. [1] It is a composite polyhedron made by attaching two equilateral square pyramids.