reflex quadrilateral

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Quadrilateral — This article is about four sided mathematical shapes. For other uses, see Quadrilateral (disambiguation). Quadrilateral Six different types of quadrilaterals Edges and vertices 4 … Wikipedia
Rectangle — Family Orthotope Type Quadrilateral Edges and vertices 4 Schläfli symbol {}x{} … Wikipedia
Angle — This article is about angles in geometry. For other uses, see Angle (disambiguation). Oblique angle redirects here. For the cinematographic technique, see Dutch angle. ∠, the angle symbol In geometry, an angle is the figure formed by two rays… … Wikipedia
Archaeology of the Cross and Crucifix — Archæology of the Cross and Crucifix † Catholic Encyclopedia ► Archæology of the Cross and Crucifix I. PRIMITIVE CRUCIFORM SIGNS The sign of the cross, represented in its simplest form by a crossing of two lines at right angles,… … Catholic encyclopedia

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