# Equilateral Triangle Calculator

An equilateral triangle is defined as a regular polygon with 3 equal sides and 3 equal angles.

## What is Equilateral Triangle Calculator?

'Cuemath's Equilateral Triangle Calculator' is an online tool that helps to calculate the area and perimeter of an equilateral triangle for a given side. Cuemath's online Equilateral Triangle Calculator helps you to calculate the area and perimeter of an equilateral triangle within a few seconds.

## How to Use Equilateral Triangle Calculator?

Please follow the steps below on how to use the calculator:

**Step 1**: Choose a drop-down list to find the area and perimeter of an equilateral triangle.**Step 1**: Enter the length of the side in the input box.**Step 2**: Click on "**Calculate**" to find the area and perimeter of an equilateral triangle.**Step 3**: Click on "**Reset**" to clear the field and enter new values.

## How to Find the Area and Perimeter of an Equilateral Triangle?

The** area of an equilateral triangle** is the area occupied by the boundary of a square. It is measured in square units. As all sides are equal in an equilateral triangle. The formula to calculate the area of an equilateral triangle is given by:

**Area of an equilateral triangle \( = { \sqrt{3} \over 4} × (side)^2\)**

The **perimeter of an equilateral triangle** is defined as the total length or distance of its boundary on all sides. As all sides are equal. The formula to calculate the perimeter of an equilateral triangle is:

**The perimeter of an equilateral triangle = 3 × side**

**Solved Example:**

Find the area and perimeter of an equilateral triangle whose side length is 3 units.

**Solution: **

Given: Length of side = 3 units

Area of an equilateral triangle** \( = { \sqrt{3} \over 4} × (side)^2\)**

= \({ \sqrt{3} \over 4} × (3)^2\)

= 3.9 square units.

Perimeter of an equilateral triangle = 3 × side

= 3 × 3

= 9 units

Similarly, you can use the calculator to find the area and perimeter of an equilateral triangle for:

- Side length = 5 units
- Side length = 13 units

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