noun
rhombus; diamond shape
Geometric term for a quadrilateral with equal sides but not necessarily right angles. Often used in mathematics; in everyday contexts, 菱形 (ひしがた) is more common.
See also: 菱形
斜方形の面積を求める公式を覚えていますか。
Do you remember the formula for finding the area of a rhombus?
Square; a rhombus with right angles.
From 斜 (しゃ, 'oblique') + 方形 (ほうけい, 'square'), literally 'oblique square'. The exact historical derivation is uncertain; the term is a modern geometric coinage.