Translation guide
A quadrilateral is a four-sided polygon. In Japanese, the general term is 四角形 (shikakukei), but specific shapes like squares and rectangles are more common in daily life.
Referring to any shape with four straight sides, such as in geometry or general description.
The standard mathematical term for any quadrilateral. Used in geometry and formal contexts.
Quadrilaterals include squares and rectangles.
A less common synonym for quadrilateral, literally 'four-side shape'. Mainly in technical contexts.
Find the area of this quadrilateral.
In daily conversation, English 'quadrilateral' is rarely used; instead, people refer to specific shapes like squares or rectangles. This meaning covers when you want to describe something as four-sided in a non-technical way.
Common word for 'square' or 'rectangle' in everyday language. Often used for objects with four corners, not strictly geometric.
This box has a square shape.
Adjective meaning 'square' or 'rectangular'. Used to describe the shape of objects.
In casual conversation, Japanese speakers rarely use 四角形 (shikakukei). Instead, they use 四角 (shikaku) for square/rectangular shapes, or specific terms like 正方形 (seihoukei, square) and 長方形 (chouhoukei, rectangle). Use 四角形 only in mathematical or formal contexts.
四角いテーブルを買いました。
I bought a square table.