# Slope of perpendicular to line

You are given the slope of one line (m_{1}) and you have to find the slope of another lie 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

Suppose we are given two perpendicular line segments AB and CD. The slope of AB is m_{1} and line CD is m_{2} .

m

_{1}* m_{2}= -1

From above, we can say

m_{2}= – 1/( m_{1}) .

**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 <bits/stdc++.h> ` `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; ` `} ` |

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## Java

`// Java program to illustarate ... ` ` ` `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)); ` ` ` `} ` `} ` |

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## 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 ` |

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## 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 ` |

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## PHP

`<?php ` `// PHP program find slope ` `// of perpendicular line ` ` ` `// Function to find the ` `// Slope of other line ` `function` `findPCSlope(` `$m` `) ` `{ ` ` ` `return` `-1.0 / ` `$m` `; ` `} ` ` ` ` ` `// Driver Code ` ` ` `$m` `= 2.0; ` ` ` `echo` `findPCSlope(` `$m` `); ` ` ` `// This code is contributed by anuj_67 ` `?> ` |

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**Output:**

-0.5

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