Acronym | teddi, J63 |
Name |
tridiminished icosahedron, ursahedron, vertex figure of sadi |
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Circumradius | sqrt[(5+sqrt(5))/8] = 0.951057 |
Inradius wrt. {3} | sqrt[(7+3 sqrt(5))/24] = 0.755761 |
Inradius wrt. {5} | sqrt[(5+sqrt(5))/40] = 0.425325 |
Vertex figures | [3,52], [33,5] |
Volume | [15+7 sqrt(5)]/24 = 1.277186 |
Surface | [5 sqrt(3)+3 sqrt(25+10 sqrt(5))]/4 = 7.326496 |
General of army | (is itself convex) |
Colonel of regiment | (is itself locally convex) |
Dihedral angles |
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Dual | titdi |
Face vector | 9, 15, 8 |
Confer |
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External links |
As abstract polytope teddi is isomorph to targi, thereby replacing pentagons and pentagrams.
Its name ursahedron is a posterior nickname, derived from its Bowers style acronym teddi. – It furthermore expands to a whole class of related polytopes, the ursatopes.
This polyhedron is an edge-faceting of the icosahedron (ike).
Incidence matrix according to Dynkin symbol
xfo3oox&#xt → height(1,2) = sqrt[(3+sqrt(5))/6] = 0.934172 height(2,3) = 1/sqrt(3) = 0.577350 ({3} || pseudo f-{3} || dual {3}) o..3o.. | 3 * * | 2 1 0 0 | 1 2 0 0 .o.3.o. | * 3 * | 0 1 2 0 | 0 2 1 0 ..o3..o | * * 3 | 0 0 2 2 | 0 1 2 1 ------------+-------+---------+-------- x.. ... | 2 0 0 | 3 * * * | 1 1 0 0 oo.3oo.&#x | 1 1 0 | * 3 * * | 0 2 0 0 wedges .oo3.oo&#x | 0 1 1 | * * 6 * | 0 1 1 0 ... ..x | 0 0 2 | * * * 3 | 0 0 1 1 ------------+-------+---------+-------- x..3o.. | 3 0 0 | 3 0 0 0 | 1 * * * xfo ...&#xt | 2 2 1 | 1 2 2 0 | * 3 * * ... .ox&#x | 0 1 2 | 0 0 2 1 | * * 3 * ..o3..x | 0 0 3 | 0 0 0 3 | * * * 1
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