also: しちかくけい · ななかっけい
heptagon
A polygon with seven sides and seven angles. Used in geometry contexts.
The sum of the interior angles of a heptagon is 900 degrees.
This shape is not a regular heptagon.
Octagon (8 sides).
Standard kanji spelling for a heptagon.
Common alternate reading with gemination.
Alternate reading using the native Japanese number なな.
Compound of 七 (seven) + 角形 (polygon). The reading しちかくけい is the most regular, while しちかっけい and ななかっけい are common variants.