Area of a triangle inside a parallelogram

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.