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# Program to calculate area and perimeter of equilateral triangle in C++

## What is Equilateral Triangle?

As the name suggests, equilateral triangle is the one that have equal sides and also it have equal interior angles of 60° each. It is also known as regular triangle because it’s a regularpolygon

Properties of equilateral triangle are −

- 3 sides of equal length
- Interior angles of same degree which is 60

Given below is the figure of equilateral triangle

## Problem

Given with the side of equilateral triangle the task is to find the area and perimeter of a triangle where area is the space occupied by the shape and perimeter is the space occupied by its boundaries.

To calculate area and perimeter of a equilateral triangle there is a formula

## Example

Input-: side=14.0 Output-: Area of Equilateral Triangle is : 84.8705 Perimeter of Equilateral Triangle: 42

## ALGORITHM

Start Step 1 -> Declare function to calculate area of equilateral trainagle Float area(float side) Return sqrt(3) / 4 * side * side Step 2 -> Declare function to calculate perimeter of equilateral trainagle Float perimeter(float side) Return 3 * side Step 3 -> In main() float side = 14.0 call area(side) call perimeter(side) Stop

## CODE

#include <bits/stdc++.h> using namespace std; //function to calculate area of equilateral triangle float area(float side){ return sqrt(3) / 4 * side * side; } //function to calculate perimeter of equilateral triangle float perimeter(float side){ return 3 * side; } int main(){ float side = 14.0; cout << "Area of Equilateral Triangle is : "<<area(side); cout << "\nPerimeter of Equilateral Triangle: "<<perimeter(side); return 0; }

## Output

Area of Equilateral Triangle is : 84.8705 Perimeter of Equilateral Triangle: 42

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