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・ Dual object
・ Dual of BCH is an independent source
・ Dual Orb
・ Dual Orb II
・ Dual overhead rate
・ Dual oxidase 1
・ Dual oxidase 2
・ Dual pair
・ Dual Peppy
・ Dual Phase Steels Magnetism Modeling
・ Dual photography
・ Dual piping
・ Dual pivot steering geometry
・ Dual player
・ Dual Plover
Dual polygon
・ Dual polyhedron
・ Dual power
・ Dual process theory
・ Dual process theory (moral psychology)
・ Dual processor
・ Dual q-Hahn polynomials
・ Dual q-Krawtchouk polynomials
・ Dual quaternion
・ Dual relationship
・ Dual representation
・ Dual representation (psychology)
・ Dual resonance model
・ Dual revolution
・ Dual role


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Dual polygon : ウィキペディア英語版
Dual polygon
In geometry, polygons are associated into pairs called duals, where the vertices of one correspond to the edges of the other.
==Properties==

Regular polygons are self-dual.
The dual of an isogonal (vertex-transitive) polygon is an isotoxal (edge-transitive) polygon. For example, the (isogonal) rectangle and (isotoxal) rhombus are duals.
In a cyclic polygon, longer sides correspond to larger exterior angles in the dual (a tangential polygon), and shorter sides to smaller angles. Further, congruent sides in the original polygon yields congruent angles in the dual, and conversely. For example, the dual of a highly acute isosceles triangle is an obtuse isosceles triangle.
In the Dorman Luke construction, each face of a dual polyhedron is the dual polygon of the corresponding vertex figure.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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