From a side
Side a
A = na²/[4 tan(π/n)]; P = na
Open calculator ↗GEOMETRY, ONE FIGURE AT A TIMERegular hexagon.
Regular hexagon.
Understand every measure.
Six triangles hiding in one shape. Four free tools, clear formulas and a little discovery along the way.
Find your calculator ↗FIGURE 142D / REFERENCE DRAWING
REGULAR HEXAGONNOT TO SCALE
THE CALCULATOR DESK
Start with what you know.
4 calculators available
From circumradius
Circumradius R
a = 2R sin(π/n)
Open calculator ↗From the apothem
Apothem r
a = 2r tan(π/n)
Open calculator ↗From area
Area A
a = √[4A tan(π/n)/n]
Open calculator ↗MEET THE FIGURE
A regular hexagon, explained.
A regular hexagon has six equal sides and six equal angles. Its centre divides it into six equilateral triangles. This special structure makes its circumradius exactly equal to its side length.
Understand the properties ↗LOOK A LITTLE CLOSER
More than a formula.
Three regular hexagons meet at a vertex to tile the plane.
The circumradius equals a side only for the regular hexagon, not for all regular polygons.
Explore three geometry facts ↗These tools use ideal Euclidean geometry. Every input must use the same unit. Numerical results are rounded and do not replace measurement, specialist design or safety checks. See worked examples.