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Area of largest triangle that can be inscribed within a rectangle
• Difficulty Level : Basic
• Last Updated : 16 Mar, 2021

Given a rectangle of length and breadth . The task is to find the area of the biggest triangle that can be inscribed in it.
Examples

```Input: L = 5, B = 4
Output: 10

Input: L = 3, B = 2
Output: 3``` From the figure, it is clear that the largest triangle that can be inscribed in the rectangle, should stand on the same base & has height raising between the same parallel sides of the rectangle.
So, the base of the triangle = B
Height of the triangle = L
Therefore Area,

`A = (L*B)/2`

Note: It should also be clear that if base of the triangle = diagonal of rectangle, still the area of triangle so obtained = lb/2 as diagonal of a rectangle divides it into 2 triangles of equal area.
Below is the implementation of the above approach:

## C++

 `// C++ Program to find the biggest triangle``// which can be inscribed within the rectangle``#include ``using` `namespace` `std;` `// Function to find the area``// of the triangle``float` `trianglearea(``float` `l, ``float` `b)``{` `    ``// a and b cannot be negative``    ``if` `(l < 0 || b < 0)``        ``return` `-1;` `    ``// area of the triangle``    ``float` `area = (l * b) / 2;``    ``return` `area;``}` `// Driver code``int` `main()``{``    ``float` `l = 5, b = 4;``    ``cout << trianglearea(l, b) << endl;``    ``return` `0;``}`

## Java

 `// Java Program to find the biggest triangle``// which can be inscribed within the rectangle``import` `java.util.*;` `class` `GFG``{``    ``// Function to find the area``    ``// of the triangle``    ``static` `float` `trianglearea(``float` `l, ``float` `b)``    ``{``    ` `        ``// a and b cannot be negative``        ``if` `(l < ``0` `|| b < ``0``)``            ``return` `-``1``;``    ` `        ``// area of the triangle``        ``float` `area = (l * b) / ``2``;``        ``return` `area;``    ``}``    ` `    ``// Driver code``    ``public` `static` `void` `main(String args[])``    ``{``        ``float` `l = ``5``, b = ``4``;``        ` `        ``System.out.println(trianglearea(l, b));``    ``}``}`

## Python3

 `# Python3 Program to find the``# biggest triangle which can be``# inscribed within the rectangle` `# Function to find the area``# of the triangle``def` `trianglearea(l, b) :` `    ``# a and b cannot be negative``    ``if` `(l < ``0` `or` `b < ``0``) :``        ``return` `-``1` `    ``# area of the triangle``    ``area ``=` `(l ``*` `b) ``/` `2``    ``return` `area` `# Driver code``l ``=` `5``b ``=` `4``print``(trianglearea(l, b))` `# This code is contributed``# by Yatin Gupta`

## C#

 `// C# Program to find the biggest``// triangle which can be inscribed``// within the rectangle``using` `System;` `class` `GFG``{``// Function to find the area``// of the triangle``static` `float` `trianglearea(``float` `l,``                          ``float` `b)``{` `    ``// a and b cannot be negative``    ``if` `(l < 0 || b < 0)``        ``return` `-1;` `    ``// area of the triangle``    ``float` `area = (l * b) / 2;``    ``return` `area;``}` `// Driver code``public` `static` `void` `Main()``{``    ``float` `l = 5, b = 4;``    ` `    ``Console.WriteLine(trianglearea(l, b));``}``}` `// This code is contributed``// by inder_verma`

## PHP

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## Javascript

 ``
Output:
`10`

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