noun
equal sides
Used in geometry to describe a polygon whose sides are all of equal length. Most commonly appears in the compound 等辺三角形 (equilateral triangle).
等辺三角形の三つの辺はすべて同じ長さです。
All three sides of an equilateral triangle are the same length.
The full compound meaning 'equilateral triangle', which is the most common context for 等辺.
Compound of 等 (equal) and 辺 (side), directly reflecting the geometric meaning.