# Slope of perpendicular to line

You are given the slope of one line (m1) and you have to find the slope of another line which is perpendicular to the given line.

Examples:

```Input : 5
Output : Slope of perpendicular line is : -0.20

Input : 4
Output : Slope of perpendicular line is : -0.25
```

## Recommended: Please try your approach on {IDE} first, before moving on to the solution.

Suppose we are given two perpendicular line segments AB and CD. The slope of AB is m1 and line CD is m2 .

m1 * m2 = -1
From above, we can say
m2 = – 1/( m1 ) .

How does above formula work?
Let slope of line AB be m1 and we need to find slope of line CD. Below diagram gives an idea about working of formula.

## C++

 `// C++ program find slope of perpendicular line ` `#include ` `using` `namespace` `std; ` ` `  `// Function to find ` `// the Slope of other line ` `double` `findPCSlope(``double` `m) ` `{ ` `    ``return` `-1.0 / m; ` `} ` ` `  `int` `main() ` `{ ` `    ``double` `m = 2.0; ` `    ``cout << findPCSlope(m); ` `    ``return` `0; ` `} `

## Java

 `// Java program to illustrate ... ` ` `  `import` `java.io.*; ` `import` `java.util.*; ` ` `  `class` `GFG { ` ` `  `    ``// Function to find ` `    ``// the Slope of other line ` `    ``static` `double` `findPCSlope(``double` `m) ` `    ``{ ` `        ``return` `-``1.0` `/ m; ` `    ``} ` ` `  `    ``public` `static` `void` `main(String[] args) ` `    ``{ ` ` `  `        ``double` `m = ``2.0``; ` `        ``System.out.println(findPCSlope(m)); ` `    ``} ` `} `

## Python 3

 `# Python 3 program find  ` `# slope of perpendicular line ` ` `  `# Function to find ` `# the Slope of other line ` `def` `findPCSlope(m): ` ` `  `    ``return` `-``1.0` `/` `m ` ` `  `m ``=` `2.0` `print``(findPCSlope(m)) ` ` `  `# This code is contributed ` `# by Smitha  `

## C#

 `// C# Program to find Slope  ` `// of perpendicular to line ` `using` `System; ` ` `  `class` `GFG { ` ` `  `    ``// Function to find ` `    ``// the Slope of other line ` `    ``static` `double` `findPCSlope(``double` `m) ` `    ``{ ` `        ``return` `-1.0 / m; ` `    ``} ` ` `  `    ``// Driver Code ` `    ``public` `static` `void` `Main() ` `    ``{ ` ` `  `        ``double` `m = 2.0; ` `        ``Console.Write(findPCSlope(m)); ` `    ``} ` `} ` ` `  `// This code is contributed by nitin mittal `

## PHP

 ` `

Output:

```-0.5
```

GeeksforGeeks has prepared a complete interview preparation course with premium videos, theory, practice problems, TA support and many more features. Please refer Placement 100 for details

My Personal Notes arrow_drop_up

Check out this Author's contributed articles.

If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.

Article Tags :
Practice Tags :

Be the First to upvote.

Please write to us at contribute@geeksforgeeks.org to report any issue with the above content.