# C++ Exercises: Calculate area of an equilateral triangle

## C++ Basic: Exercise-53 with Solution

Write a C++ program to calculate the area of an equilateral triangle.

**Pictorial Presentation:**

**Sample Solution**:

**C++ Code :**

```
#include<iostream>
using namespace std;
#include<math.h>
main(){
float s1;
float area;
cout << "\n\n Calculate the area of the Equilateral Triangle :\n";
cout << " ----------------------------------------------------\n";
cout<<" Input the value of the side of the equilateral triangle: ";
cin>>s1;
area = sqrt(3)/4*(s1*s1);
cout<<" The area of equilateral triangle is: "<<area<<endl;
cout << endl;
return 0;
}
```

Sample Output:

Calculate the area of the Equilateral Triangle : ---------------------------------------------------- Input the value of the side of the equilateral triangle: 5 The area of equilateral triangle is: 10.8253

**Flowchart: **

**C++ Code Editor:**

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**Previous:** Write a program in C++ to enter two angles of a triangle and find the third angle.

**Next:** Write a program in C++ to enter P, T, R and calculate Simple Interest.

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## C++ Programming: Tips of the Day

**Why is there no std::stou? **

The most pat answer would be that the C library has no corresponding "strtou", and the C++11 string functions are all just thinly veiled wrappers around the C library functions: The std::sto* functions mirror strto*, and the std::to_string functions use sprintf.

Ref: https://bit.ly/3wtz2qA

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