How does the Regular Polygon Calculator work?

Area = (n × s²) / (4 × tan(π/n)) Then: Interior angle = (n−2) × 180° / n Then: Exterior angle = 360° / n Then: Circumradius R = s / (2sin(π/n)); Apothem a = s / (2tan(π/n)).

Can you give an example of how to use the Regular Polygon Calculator?

Example: Input Regular octagon, side 3cm gives a result of Area = (8×9)/(4×tan(22.5°)) = 72/1.657 = 43.46 cm²; Interior angle = 135°.

Is the Regular Polygon Calculator free to use?

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

How accurate is the Regular Polygon Calculator?

Our Regular Polygon Calculator uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

Toán học

Regular Polygon Calculator

Regular Polygon

Number of sides (n)

Side length (s)

A regular polygon calculator computes area, perimeter, interior and exterior angles, circumradius, and apothem for any regular polygon (equal sides and angles).

Symbol	Name	Unit	Description
n	Number of sides	—	—
s	Side length	units	—
A	Area	square units	—

n	Name	Interior angle	Area (s=1)
3	Equilateral triangle	60°	0.433
4	Square	90°	1.000
5	Pentagon	108°	1.720
6	Hexagon	120°	2.598
8	Octagon	135°	4.828
12	Dodecagon	150°	11.196

References

›Regular polygon — Wolfram MathWorld

🔒

100% Miễn phí

Không cần đăng ký

✓

Chính xác

Công thức đã xác minh

⚡

Tức thì

Kết quả khi nhập

📱

Sẵn sàng di động

Mọi thiết bị

Regular Polygon Calculator

Regular Polygon

Là gì Regular Polygon Calculator?

Công thức

Chú giải biến

Cách Regular Polygon Calculator

Ví dụ có lời giải

Ứng dụng thực tế

Sơ đồ trực quan

Regular Polygon Reference

Câu hỏi thường gặp

Cài đặt

Regular Polygon