C++ Exercises: Calculate Area Of An Equilateral Triangle - W3resource

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C++ Exercises: Calculate area of an equilateral triangle

Last update on November 13 2025 12:29:29 (UTC/GMT +8 hours)

Equilateral Triangle Area

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

Visual Presentation:

C++ Exercises: Calculate area of an equilateral triangle

Sample Solution:

C++ Code :

#include<iostream> // Including input-output stream header file using namespace std; // Using the standard namespace #include<math.h> // Including the math library header file for mathematical operations int main() { // Start of the main function float s1; // Declaring a variable to store the side length of the equilateral triangle float area; // Declaring a variable to store the area of the equilateral triangle cout << "\n\n Calculate the area of the Equilateral Triangle :\n"; // Displaying the purpose of the program cout << " ----------------------------------------------------\n"; cout << " Input the value of the side of the equilateral triangle: "; // Prompting the user to input the side length cin >> s1; // Taking input of the side length from the user area = sqrt(3) / 4 * (s1 * s1); // Calculating the area of the equilateral triangle using the formula cout << " The area of the equilateral triangle is: " << area << endl; // Displaying the calculated area cout << endl; // Displaying an empty line for better readability return 0; // Returning 0 to indicate successful program execution }

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:

Flowchart: Calculate area of an equilateral triangle

For more Practice: Solve these Related Problems:

  • Write a C++ program that calculates the area of an equilateral triangle using both the standard formula and Heron’s formula for verification.
  • Write a C++ program to compute the area of an equilateral triangle, then scale the triangle by a factor and recalculate the area.
  • Write a C++ program that takes the side of an equilateral triangle as input and outputs the area rounded to four decimal places using fixed-point notation.
  • Write a C++ program to calculate the area of an equilateral triangle and compare it with the area of a triangle of the same perimeter.

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