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)

• Fejes Tóth's Integral
• Fejes Tóth's Problem
• Feller-Lévy Condition
• Feller's Coin-Tossing Constants
• Fence
• Fence Poset
• Ferguson-Forcade Algorithm
• Fermat 4n+1 Theorem
• Fermat Compositeness Test
• Fermat Conic
• Fermat Difference Equation
• Fermat Diophantine Equation
• Fermat Equation
• Fermat-Euler Theorem
• Fermatian
• Fermat-Lucas Number
• Fermat Number
• Fermat Number (Lucas)
• Fermat Point
• Fermat Polynomial
• Fermat Prime
• Fermat Pseudoprime
• Fermat Quotient
• Fermat's Algorithm
• Fermat's Congruence