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Regular Polygon Calculator

Properties of regular polygons

Regular Polygon Calculator

A regular polygon has all sides equal and all interior angles equal. As the number of sides increases, it approaches a circle. Regular polygons are used in architecture, design, and tessellations.

  1. 1Sum of interior angles = (n−2) × 180°
  2. 2Each interior angle = (n−2) × 180° / n
  3. 3Area = (n × s²) / (4 × tan(π/n))
  4. 4Apothem (inradius) = s / (2 × tan(π/n))
PolygonSidesInterior angleSum of angles
Triangle360°180°
Square490°360°
Pentagon5108°540°
Hexagon6120°720°
Octagon8135°1,080°
Decagon10144°1,440°
Dodecagon12150°1,800°

Fun Fact

Honeycombs use regular hexagons because they tile the plane perfectly and use the least wax for the most storage area — a property mathematically proven in 1999.

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