Octagon (EntityTopic, 12)
From Hi.gher. Space
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<blockquote>2(1 + √2) · ''l''<sup>2</sup></blockquote> | <blockquote>2(1 + √2) · ''l''<sup>2</sup></blockquote> | ||
| - | == | + | == Dissection == |
| - | The octagon of side 1 may be [[ | + | The octagon of side 1 may be [[dissect]]ed into 8× isosceles [[triangle]] with sides {1,2×√(1+<sup>√2</sup>⁄<sub>2</sub>)}. |
== Use == | == Use == | ||
Revision as of 15:07, 21 November 2011
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)}.
Use
Octagonal faces are found in these trishapes on FGwiki:
- Cubic truncate (6×, 63%)
- Octagonal prism (2×, 20%)
| Notable Dishapes | |
| Flat: | triangle • square • pentagon • hexagon • octagon • decagon |
| Curved: | circle |
