Compute all properties of an equilateral triangle from one side length.
All sides and angles of an equilateral triangle are equal (60° each). Its area, height, inradius and circumradius are all derived from the single side length.
Area
A = (√3/4) × s²
Height
h = (√3/2) × s
Yes — all equilateral triangles are similar because they all have three 60° angles. They differ only in scale.
For an equilateral triangle, the circumradius is exactly twice the inradius: R = 2r.