Archimedean-Catalan Hulls

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Joined Truncated Tetrahedron
Vertices:  20  (4[3] + 12[3] + 4[6])
Faces:18  (12 kites + 6 rhombi)
Edges:36  (12 short + 24 long)
Symmetry:  Full Tetrahedral  (Td)
Long Edge Angle:  acos(−2/3)    ≈131.810314896 degrees
Short Edge Angle:  acos(−8/9)    ≈152.733955549 degrees
(values below based on unit-edge-length Truncated Tetrahedron)
Short Edge (12):  sqrt(34)/10    ≈0.58309518948453004709
Long Edge (24):  sqrt(10)/2    ≈1.5811388300841896660
Rhombus Length:  3
Rhombus Width:  1
Kite Length:  9/5    1.8
Kite Width:  1
[3]-Vertex Radius (4):  9*sqrt(6)/20    ≈1.1022703842524301442
[3]-Vertex Radius (12):  sqrt(22)/4    ≈1.1726039399558573886
[6]-Vertex Radius (4):  3*sqrt(6)/4    ≈1.8371173070873835736
Inscribed Radius:  3*sqrt(2)/4    ≈1.0606601717798212866
Volume:99*sqrt(2)/20    ≈7.0003571337468204916


References:[1]Conway Notation for Polyhedra (George Hart)