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GeomBench
Works for any number of sides, from triangles to 20-gons.
Every regular polygon can be split into n identical isosceles triangles meeting at the center. Summing their areas gives A = (n × s²) ÷ (4 × tan(π/n)) — valid for a triangle, hexagon, or any n-gon.
The more sides a regular polygon has, the closer its area gets to that of its circumscribed circle — a hexagon is already a decent approximation, and a 20-gon is nearly indistinguishable from round.
Area
64.952
What you entered
Perimeter
6 × 5= 30Area = (n × s²) ÷ (4 × tan(π/n))
(6 × 5²) ÷ (4 × tan(π/6))= 64.9519Result
Area: 64.952
A regular 6-sided polygon with side length 5 has an area of 64.952 and a perimeter of 30.