Symmetric Canonical Self-Dual Heptahedra

4 total:  2 

2 have C3v symmetry:  1 

This is the only one with 3 edge lengths

(box: x-ray)  (F: faces)  (slider: perspective)  (image: L=rotate R=zoom)  (M: metrics)

Self-Dual Heptahedron #2 (canonical)
Vertices:  7  (1[3] + 3[3] + 3[4])
Faces:7  (1 equilateral triangle + 3 isosceles triangles + 3 kites)
Edges:12  (3 short + 6 medium + 3 long)
Symmetry:  3-fold Pyramidal  (C3v)
Kite-Kite Angle:  acos(1/11)    ≈84.784091430 degrees
Kite-Triangle Angle:  acos(−sqrt(1595*(395−144*sqrt(5)))/1595)    ≈102.3535656054 degrees
Triangle-Triangle Angle:  acos(−sqrt(435*(15−4*sqrt(5)))/145)    ≈110.729999407 degrees
(values below based on edge-scribed radius = 1)
Short Edge (3):  (3*sqrt(30)−5*sqrt(6))/3    ≈1.3947426704130309709
Medium Edge (6):  2*(3*sqrt(30)−5*sqrt(6))/5    ≈1.6736912044956371651
Long Edge (3):  2*sqrt(30)/5    ≈2.1908902300206644538
Edge-scribed Radius:  1
Volume:4*(45−11*sqrt(5))/25    ≈3.2645203596003701343