Octagon (EntityTopic, 12)
From Hi.gher. Space
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== Equations == | == Equations == | ||
*The area of a regular octagon with side length ''l'' is: | *The area of a regular octagon with side length ''l'' is: | ||
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The octagon of side 1 may be [[dissect]]ed into 8× isosceles [[triangle]] with sides {1,2×√(1+<sup>√2</sup>⁄<sub>2</sub>)}. | The octagon of side 1 may be [[dissect]]ed into 8× isosceles [[triangle]] with sides {1,2×√(1+<sup>√2</sup>⁄<sub>2</sub>)}. | ||
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{{Dishapes}} | {{Dishapes}} | ||
Revision as of 22:05, 16 February 2014
Equations
- The area of a regular octagon with side length l is:
2(1 + √2) · l2
Dissection
The octagon of side 1 may be dissected into 8× isosceles triangle with sides {1,2×√(1+√2⁄2)}.
Incidence matrix
Usage as facets
- prism: 2× 1-facets of a octagonal prism
- 6× 1-facets of a truncated cube
- 6× 1-facets of a stauropantohedron
- 1× 1-facets of a square cupola
| Notable Dishapes | |
| Flat: | triangle • square • pentagon • hexagon • octagon • decagon |
| Curved: | circle |
