| Vertices: | 14 (14[3]) |
| Faces: | 9 (7 squares + 2 regular 7/2 heptagrams) |
| Edges: | 21 |
| Symmetry: | 7-fold Prismatic (D7h) |
| Heptagram-Square Angle: | acos(0) | 90 degrees |
| Square-Square Angle: | acos(root[8*(x^3)−4*(x^2)−4*x+1])
= acos(sin(π/14)) | 540/7 degrees |
| Dual Solid: | Heptagrammic 7/2 Dipyramid |
| (values below based on edge length = 1) |
| Circumscribed Radius: | sqrt(root[448*(x^3)−1232*(x^2)+980*x−239])
= sqrt(cot(2*π/7)*cot(2*π/7)+2)/2 | ≈0.81178257649071064214 |
| Midscribed Radius: | sqrt(root[7*(x^3)−14*(x^2)+7*x−1])
= 1/(2*sin(2*π/7)) | ≈0.63952400384496630287 |
| Heptagram Center Radius: | 1/2 | 0.5 |
| Square Center Radius: | sqrt(root[448*(x^3)−560*(x^2)+84*x−1])
= cot(2*π/7)/2 | ≈0.39873669444120198071 |