Translation guide
In Japanese, expressing "three sides" depends on whether you mean three sides of a physical object, three parties in a discussion, or a three-sided shape. The most common and direct translation is 三辺 (さんぺん), but other expressions are used in specific contexts.
Referring to the three edges or faces of an object, such as a triangle, a box, or a piece of paper.
The most direct translation for 'three sides' in a geometric or physical sense. Used for triangles, objects with three edges, etc.
The lengths of the three sides of this triangle are equal.
Please measure the three sides of the box.
Literally 'three directions' or 'three sides', often used for three-sided views or perspectives, such as a three-sided mirror or a three-way intersection.
Check the back view with a three-sided mirror.
Means 'three faces' or 'three surfaces', used for objects with three distinct faces, like a three-sided pillar or a three-page spread.
Read the three-page article (literally 'three-face article').
Referring to three sides in a negotiation, conflict, or conversation, such as 'three-sided talks' or 'three-way agreement'.
Means 'three parties' or 'three persons/groups'. Commonly used in formal contexts like 'three-party talks' (三者会談) or 'three-sided agreement' (三者合意).
Three-party talks were held.
We reached a three-sided agreement.
Literally 'three comma shapes', refers to a three-way struggle or contest. Used for situations where three sides are competing or in conflict.
Means 'three directions' or 'three fronts', used for attacks or approaches from three sides.
The enemy attacked from three sides.
Describing something that is triangular or has three sides as a shape.
The standard word for 'triangle'. Use this when you mean a three-sided shape.
Please draw a triangle (a three-sided shape).
A shorter, more casual word for 'triangle' or 'three-cornered'. Often used in compounds like 三角関係 (love triangle).
三辺 (さんぺん) is for edges or sides of a shape/object. 三方 (さんぽう) is for directions or perspectives. 三面 (さんめん) is for surfaces or faces. Choose based on what aspect of 'side' you mean.
Do not directly translate 'three sides' as 三つの側面 (みっつのそくめん) unless you specifically mean 'three aspects' or 'three lateral faces'. It sounds unnatural for physical sides.
The election became a three-sided battle.
三角の土地
a triangular (three-sided) plot of land