semicircle
A building plan with one main straight edge and one arc, occupying no more than 75% of the corresponding circle or oval.
A semicircle is a shape formed by one straight side and one arc. It may be an exact half-circle, a thin slice of a circle's or oval's edge, or a bulbous shape with a prominent straight edge. It cannot be more than 75% of a complete circle by total area, or of a complete oval if the completed perimeter would form an oval.
Any side of a semicircle can have slight irregularities as long as the whole shape produces the general impression of a semicircle. The circular side can be composed of multiple straight lines that meet at oblique angles.
This perimeter category includes more than an exact half-circle, but retains its 75 percent maximum. An arc describes a curved, open-ended plan, while this form has a prominent straight edge closing the rounded outline.
In other languages
- Deutsch
- Ein Gebäudeplan in Form eines Kreises, der in der Hälfe geteilt ist.
Related definitions
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arc
A building plan following a single open curve without reversing direction or closing into a loop. -
circle
A roughly circular building outline, including regular polygons with nine or more sides and minor perimeter details. -
cross
A building plan formed by two straight members intersecting within 22.5 degrees of a right angle. -
ellipse
An oval or nearly oval building plan, including a rectangle with two curved sides blending into a continuous outline. -
heptagon
A building plan with seven discernible principal sides meeting at convex angles, with unequal sides permitted. -
hexagon
A building plan with six roughly equal principal sides meeting at similar convex angles. -
irregular
A building plan whose overall outline cannot readily be assigned to another defined perimeter form. -
jagged polygon
A building plan with many corners and several perimeter indentations, arranged regularly or irregularly. -
multi-winged
A building plan with at least two wings branching from a spine, excluding wings that all radiate from one point. -
octagon
A building plan with eight roughly equal sides, including sufficiently chamfered squares that appear octagonal. -
open angle
A building plan with two roughly linear segments meeting at one point, or a simple shape with a notch of at least 45 degrees. -
parallelogram
A floor plan with 4 sides in 2 parallel pairs which do not meet in right angles. -
pentagon
A building plan with five principal sides, allowing unequal lengths and minor notches or corner changes. -
radial-lobed
A floor plan in the shape of a flower or star, with radial wings arranged around a common center. -
rectangle
A floor plan with 4 sides meeting at right angles and one axis longer than the other. -
square
A four-sided building plan with right-angle corners and side lengths differing by no more than 5% of the shortest side. -
trapezoid
A four-sided building plan with nonparallel sides, distinguished here from square and rectangular plans. -
triangle
A building plan with three dominant straight sides, allowing unequal lengths and slightly rounded or chamfered corners. -
wave
A building plan following one curved path with at least two rounded bends in alternating directions. -
zig-zag
A floor plan with 3 or more sections connected in a line bending in alternating directions.