ladder/05/011 expected 8 faces (the stock's 6 and one per hole). With equal
radii the two walls cross along two ellipses that meet at the two points
where the walls are tangent (x = 25 and 35, y = 20, z = 10), so each wall is
left in two pieces that touch only at those points, with no edge between
them: separate faces, 10 in all. SMLib makes those 10 (volume exact); truck's
8 came with an invalid record. Derivation in the case's method.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017itGh5fpMEousnZ91cYcVt
jyvikoandClaude Opus 5.5
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