| Vertices: | 18 (18[3]) |
| Faces: | 11 (9 squares + 2 regular enneagons) |
| Edges: | 27 (all same length) |
| Symmetry: | 9-fold Prismatic (D9h) |
| Enneagon-Square Angle: | acos(0) | 90 degrees |
| Square-Square Angle: | acos(-root[8*(x^3)−6*x+1]) | 140 degrees |
| Dual Solid: | Simplest D9h (1 of 2) |
| (values below based on midscribed radius = 1) |
| Edge Length: | sqrt(root[(x^3)−6*(x^2)+9*x−3]) | ≈0.68404028665133746609 |
| Circumscribed Radius: | sqrt(root[64*(x^3)−288*(x^2)+420*x−199]) | ≈1.0568716944078457920 |
| Midscribed Radius: | 1 |
| Enneagon Center Radius: | sqrt(root[64*(x^3)−96*(x^2)+36*x−3]) | ≈0.34202014332566873304 |
| Square Center Radius: | root[8*(x^3)−6*x−1] | ≈0.939692620785908384054 |
| Volume: | root[64*(x^3)+432*(x^2)−2187] | ≈1.9786167935365877282 |