noun
Geometric term for an eight-sided polygon. Used in mathematics and everyday descriptions of shapes.
この建物は八辺形の形をしている。
This building is shaped like an octagon.
正八辺形の内角の和を計算しなさい。
Calculate the sum of the interior angles of a regular octagon.
Hexagon. Similar geometric term with a different number of sides.
Compound of 八 (eight), 辺 (side), and 形 (shape). A straightforward kanji-based term for an eight-sided polygon.