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A regular polygon calculator computes area, perimeter, interior and exterior angles, circumradius, and apothem for any regular polygon (equal sides and angles).
공식
Interior angle = (n − 2) × 180 / n; Perimeter = n × side; Area = (n × side² × cot(180/n)) / 4
- n
- Number of sides
- s
- Side length (units)
- A
- Area (square units)
단계별 가이드
- 1Area = (n × s²) / (4 × tan(π/n))
- 2Interior angle = (n−2) × 180° / n
- 3Exterior angle = 360° / n
- 4Circumradius R = s / (2sin(π/n)); Apothem a = s / (2tan(π/n))
풀어진 예시
입력
Regular octagon, side 3cm
결과
Area = (8×9)/(4×tan(22.5°)) = 72/1.657 = 43.46 cm²; Interior angle = 135°
자주 묻는 질문
What's the interior angle of a regular hexagon?
(6−2) × 180 / 6 = 720 / 6 = 120°.
Why is a circle considered a polygon with infinite sides?
As n increases, polygon approaches circle shape. Limit of regular n-gon as n→∞ = circle.
How many sides does a regular polygon need to look circular?
Visually, ~20+ sides looks very circular. Mathematically, infinite for true circle.
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