Omni Calculator logo

Heptagon Calculator

Created by Rahul Dhari
Reviewed by Kenneth Alambra
Last updated: Jan 16, 2024


The heptagon calculator will assist you in finding parameters related to the heptagon shape. Be it the sides of a heptagon or perimeter or area, this calculator can help you with all of that. You can start by entering some numbers in the tool or reading on to understand what a heptagon is.

Heptagon — Area, Perimeter, and Side length

A heptagon is a polygon with 7 sides and 7 angles. The words heptagon and septagon are from Greek and Latin origins, with "hept" and "sept" referring to 7. For a regular polygon with nn sides, the internal and external angles, α\alpha & β\beta are

α=(n2)πnβ=2πn\alpha = \frac{(n - 2)\pi}{n}\\[1em] \beta = \frac{2\pi}{n}

The area and the perimeter, PP of the heptagon (n=7n=7) is

Area=n4×a2×cot(πn)Area=74×a2×cot(π7)Area=3.634a2P=n×aP=7×a\begin{align*} \text{Area} &= \frac{n}{4} \times a^2 \times \cot \left ( \frac{\pi}{n} \right )\\[1em] \text{Area} &= \frac{7}{4} \times a^2 \times \cot \left ( \frac{\pi}{7} \right )\\[1em] \text{Area} &= 3.634 a^2\\ P &= n \times a\\ P &= 7 \times a\\ \end{align*}

Using the heptagon calculator

Let's calculate the area of the heptagon with a side of 8 cm to understand the heptagon calculator usage.

  1. Enter the length of the side, a=8 cma = 8\ \text{cm}.

  2. The perimeter of the heptagon is 8 cm×7=56 cm8\ \text{cm}\times 7 = 56\ \text{cm}.

  3. The area of the heptagon is

Area=74×a2×cot(π7)Area=3.634×82=232.57 cm2\scriptsize \qquad \begin{align*} \text{Area} &= \frac{7}{4} \times a^2 \times \cot \left ( \frac{\pi}{7} \right )\\[1em] \text{Area} &= 3.634 \times 8^2 = 232.57 \text{ cm}^2 \end{align*}
  1. The internal angle, α\alpha and exterior angle, β\beta are 128.57128.57^\circ and 51.4351.43^\circ

  2. The radius of the circumcircle is

R=a2sin(π7)R=82sin(π7)=9.219 cm\scriptsize \qquad \begin{align*} R &= \frac{a} {2\sin(\frac{\pi}{7})}\\[1em] R &= \frac{8} {2\sin(\frac{\pi}{7})} = 9.219 \text{ cm} \end{align*}
  1. The radius of the incircle is
r=a2tan(π7)r=82tan(π7)=8.306 cm\scriptsize \qquad \begin{align*} r &= \frac{a} {2\tan(\frac{\pi}{7})}\\[1em] r &= \frac{8} {2\tan(\frac{\pi}{7})} = 8.306 \text{ cm} \end{align*}

If you like this tool, you might be interested in some of our similar polygon-related calculators:

FAQ

What do you mean by a heptagon?

A heptagon is a 7-sided polygon. It is also known as septagon. The prefix in the word "hept-" and "sept-" are of Greek and Latin origin, respectively.

How many sides do a heptagon have?

A heptagon has 7 sides. Its figure has 7 sides and 7 angles. The angle between each side of a regular heptagon is 128.57°.

How do I find the area of a heptagon?

To find the area of a heptagon:

  1. Find the square of the side of the heptagon.
  2. Multiply the square by 3.634 to obtain the area of the heptagon.
Rahul Dhari
regular polygon with sides, angles,circumcircle and incircle radii marked.








Name
regular septagon
Parameters
Side (a)
in
Perimeter
in
Area
in²
α
128.57
deg
β
51.43
deg
Circumcircle radius (R)
in
Incircle radius/ apothem (r)
in
Check out 23 similar 2d geometry calculators 📏
AreaArea of a rectangleArea of crescent… 20 more
People also viewed…

45 45 90 triangle

How to solve the 45 45 90 triangle? What are the 45 45 90 triangle rules? The 45 45 90 triangle calculator has the answers!

Car vs. Bike

Everyone knows biking is fantastic, but only this Car vs. Bike Calculator turns biking hours into trees! 🌳

Fibonacci

Fibonacci calculator finds the arbitrary terms of the Fibonacci sequence.

Podcasts

Do you feel like you could be doing something more productive or educational while on a bus? Or while cleaning the house? Well, why don't you dive into the rich world of podcasts! With this podcast calculator, we'll work out just how many great interviews or fascinating stories you can go through by reclaiming your 'dead time'!
Copyright by Omni Calculator sp. z o.o.
Privacy, Cookies & Terms of Service