Area of a triangle inside a parallelogram

Namachila November 19, 2025

0 2 2 minutes read

Given the base and height of the parallelogram ABCD are b and h respectively. The task is to calculate the area of the triangle ▲ABM (M can be any point on upper side) constructed on the base AB of the parallelogram as shown below:

Examples:

Input: b = 30, h = 40
Output: 600.000000

Approach:

Area of a triangle constructed on the base of parallelogram and touching at any point on the opposite parallel side of the parallelogram can be given as = 0.5 * base * height

Hence, Area of ▲ABM = 0.5 * b * h
Below is the implementation of the above approach:

C++

#include <iostream>
using namespace std;
 
// function to calculate the area
float CalArea(float b, float h)
{
    return (0.5 * b * h);
}
// driver code
int main()
{
    float b, h, Area;
    b = 30;
    h = 40;
 
    // function calling
    Area = CalArea(b, h);
    // displaying the area
    cout << "Area of Triangle is :" << Area;
    return 0;
}

C

#include <stdio.h>
 
// function to calculate the area
float CalArea(float b, float h)
{
    return (0.5 * b * h);
}
 
// driver code
int main()
{
    float b, h, Area;
    b = 30;
    h = 40;
 
    // function calling
    Area = CalArea(b, h);
 
    // displaying the area
    printf("Area of Triangle is : %f\n", Area);
    return 0;
}

Java

public class parallelogram {
    public static void main(String args[])
    {
        double b = 30;
        double h = 40;
 
        // formula for calculating the area
        double area_triangle = 0.5 * b * h;
 
        // displaying the area
        System.out.println("Area of the Triangle = " + area_triangle);
    }
}

Python

b = 30
h = 40 
 
# formula for finding the area
area_triangle = 0.5 * b * h
 
# displaying the output
print("Area of the triangle = "+str(area_triangle))

C#

using System;
class parallelogram {
    public static void Main()
    {
        double b = 30;
        double h = 40;
 
        // formula for calculating the area
        double area_triangle = 0.5 * b * h;
 
        // displaying the area
        Console.WriteLine("Area of the triangle = " + area_triangle);
    }
}

PHP

<?php    
   $b = 30;  
   $h = 40;  
   $area_triangle=0.5*$b*$h;  
    echo "Area of the triangle = ";  
    echo $area_triangle;  
?> 

Javascript

<script>
    var b = 30;
    var h = 40;
 
    // formula for calculating the area
    var area_triangle = 0.5 * b * h;
 
    // displaying the area
    document.write("Area of the Triangle = " + area_triangle.toFixed(6));
 
// This code is contributed by Rajput-Ji 
</script>

Output:

Area of triangle is : 600.000000

Time complexity: O(1), since there is no loop or recursion.

Auxiliary Space: O(1), since no extra space has been taken.

Recommended

Solve DSA problems on GfG Practice.

Solve Problems

Feeling lost in the world of random DSA topics, wasting time without progress? It’s time for a change! Join our DSA course, where we’ll guide you on an exciting journey to master DSA efficiently and on schedule.
Ready to dive in? Explore our Free Demo Content and join our DSA course, trusted by over 100,000 zambiatek!