Acronym | ... |
Name | general 7-2-stepprism |
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Circumradius | sqrt(A2+B2) |
Coordinates | (A sin(2πk/7), A cos(2πk/7), B sin(2πk/7), B cos(2πk/7)) 0 ≤ k ≤ 6 |
Face vector | 7, 21, 28, 14 |
Confer |
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An n-m-step prism is inscribed within an according variant of an n-duoprism, in fact it cycles a subset of its vertices in the n×n grid by means of an inclined line of slope n/m. It then uses the convex hull of that subset of points.
Let y = x(7,2) = sin(2π/7)/sin(π/7) = 1.801938 and z = x(7,3) = sin(3π/7)/sin(π/7) = 2.246980 then the edge sizes, as given below, would be a = sqrt(A2+y2B2), b = sqrt(y2A2+z2B2), and c = sqrt(z2A2+B2).
7 | 2 2 2 | 3 3 6 | 4 4 verf: bi-apiculated tet --+-------+--------+---- 2 | 7 * * | 2 1 2 | 3 2 a (5-valence) 2 | * 7 * | 1 0 2 | 2 1 b (3-valence) 2 | * * 7 | 0 2 2 | 1 3 c (4-valence) --+-------+--------+---- 3 | 2 1 0 | 7 * * | 2 0 aab 3 | 1 0 2 | * 7 * | 0 2 acc 3 | 1 1 1 | * * 14 | 1 1 abc --+-------+--------+---- 4 | 3 2 1 | 2 0 2 | 7 * phyllic disphenoid type 1 4 | 2 1 3 | 0 2 2 | * 7 phyllic disphenoid type 2
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