| Vertices: | 16 (16[4]) |
| Faces: | 18 (16 equilateral triangles + 2 regular octagrams) |
| Edges: | 32 |
| Symmetry: | 8-fold Antiprismatic (D8v) |
| Octagram-Triangle Angle: | acos(sqrt(3*(7−4*sqrt(2)
+2*sqrt(2*(10−7*sqrt(2)))))/3) | ≈30.223804418 degrees |
| Triangle-Triangle Angle: | acos((2*sqrt(2−sqrt(2))+1)/3) | ≈327.519889299 degrees |
| Dual Solid: | Octagrammic Concave Trapezohedron |
| (values below based on edge length = 1) |
| Circumscribed Radius: | sqrt(2*(6−2*sqrt(2)−sqrt(2*(10−7*sqrt(2)))))/4 | ≈0.58344144372912916858 |
| Midscribed Radius: | sqrt(2*(4−2*sqrt(2)−sqrt(2*(10−7*sqrt(2)))))/4 | ≈0.30067244346752264027 |
| Octagram Center Radius: | sqrt(2*(2*sqrt(2)−sqrt(2*(10−7*sqrt(2)))−2))/4 | ≈0.21796949201041443551 |
| Triangle Center Radius: | −sqrt(6*(10−6*sqrt(2)
−3*sqrt(2*(10−7*sqrt(2)))))/12 | ≈−0.084086770228123667076 |