Gyroelongated Square Dipyramid

One of the eight convex Deltahedra. It consists of two oppositely faced SquarePyramids rotated 45° to each other and separated by a ribbon of eight side-to-sideTriangles. It is Johnson Solid .

Call the coordinates of the upper Pyramid bases (± 1, ± 1, ) and of the lower (, 0,) and (0, , ). Call the Pyramid apexes (0, 0, ). Consider the points (1, 1, 0)and (0, 0, ). The height of the Pyramid is then given by

(1)

(2)

(3)

(4)

			(5)
			(6)

• Equipollent
• Equipotent
• Equipotential Curve
• Equiproduct Point
• Equireciprocal Point
• Equirectangular Projection
• Equiripple
• Equitangential Curve
• Equivalence Class
• Equivalence Problem
• Equivalence Relation
• Equivalent
• Equivalent Matrix
• Eratosthenes Sieve
• Erdös-Anning Theorem
• Erdös-Kac Theorem
• Erdös-Mordell Theorem
• Erdös Number
• Erdös Reciprocal Sum Constants
• Erdös-Selfridge Function
• Erdös Squarefree Conjecture
• Erdös-Szekeres Theorem
• Erf
• Erfc
• Erfi