Crind (EntityTopic, 10)

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{{Shape|Crind|http://img46.imageshack.us/img46/779/crind1pt.png|3|4, 4, 2|0|N/A|N/A|([xy]z)|N/A|[[Square]], edge 1|N/A|N/A|N/A|([xy]z)|11|none|''Unknown''|''Unknown''|N/A|SSC}}
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A '''crind''' is the [[intersect]]ion of two perpendicular [[cylinder]]s. Due to momentum it will behave similarly to a [[duocylinder]] if left to roll on a [[surface]]. However, unlike a duocylinder, a crind can be stopped and then rolled in a different direction without needing to [[rotate]] it.
A '''crind''' is the [[intersect]]ion of two perpendicular [[cylinder]]s. Due to momentum it will behave similarly to a [[duocylinder]] if left to roll on a [[surface]]. However, unlike a duocylinder, a crind can be stopped and then rolled in a different direction without needing to [[rotate]] it.

Revision as of 15:59, 14 March 2008


A crind is the intersection of two perpendicular cylinders. Due to momentum it will behave similarly to a duocylinder if left to roll on a surface. However, unlike a duocylinder, a crind can be stopped and then rolled in a different direction without needing to rotate it.

The crind is also one of the few curved polyhedra that satisfies Euler's F + V = E + 2.

Its maximal and minimal compressions are an irregular octahedron and a line segment respectively.

Equations

  • Assumption: Crind is centered at the origin.
  • Variables:
r ⇒ radius of crind
  • All points (x, y, z) that lie on the surface of a crind will satisfy the following equations:
x + yx + z = r
   -- or --
x + zx + y = r
  • All points (x, y, z) that lie on the edges of a crind will satisfy the following equation:
x + y = x + z = r
total edge length = 4πsqrt(2)r
surface area = Unknown
volume = πr3
Unknown
[x:xy,x:xz] ⇒ ellipse with major radius rsin(45° + (θ % 90°)√2 and minor radius r
[y:xy,y:yz,z:xz,z:yz] ⇒ "circle with ends cut" of unknown proportions


Notable Trishapes
Regular: tetrahedroncubeoctahedrondodecahedronicosahedron
Direct truncates: tetrahedral truncatecubic truncateoctahedral truncatedodecahedral truncateicosahedral truncate
Mesotruncates: stauromesohedronstauroperihedronstauropantohedronrhodomesohedronrhodoperihedronrhodopantohedron
Snubs: snub staurohedronsnub rhodohedron
Curved: spheretoruscylinderconefrustumcrind


10. <(xy)z>
Bicone
11. ([xy]z)
Crind
12. (z)
Narrow crind
List of bracketopes