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Check if two given Circles are Orthogonal or not

  • Difficulty Level : Basic
  • Last Updated : 19 Mar, 2021

Given are two circles with their centres C1(x1, y1) and C2(x2, y2) and radius r1 and r2, the task is to check if both the circles are orthogonal or not. 
Two curves are said to be orthogonal if their angle of intersection is a right angle i.e the tangents at their point of intersection are perpendicular.
 

The above two circles are orthogonal

Examples: 
 

Input: C1(4, 3), C2(0, 1), r1 = 2, r2 = 4 
Output: Yes

Input: C1(4, 3), C2(1, 2), r1 = 2, r2 = 2 
Output: No

 

Approach: 
 

  • Find the distance between the centres of two circles ‘d’ with distance formula.
  • For the circles to be orthogonal we need to check if
r1 * r1 + r2 * r2 = d * d
  • If it is true, then both the circles are orthagonal. Else not.

Below is the implementation of the above approach:
 

C++




// C++ program to check if two
// circles are orthogonal or not
 
#include <bits/stdc++.h>
using namespace std;
 
// Function to Check if the given
// circles are orthogonal
bool orthogonality(int x1, int y1, int x2,
                   int y2, int r1, int r2)
{
 
    // calculating the square
    // of the distance between C1 and C2
    int dsquare = (x1 - x2) * (x1 - x2)
                  + (y1 - y2) * (y1 - y2);
 
    // Check if the given
    // circles are orthogonal
    if (dsquare == r1 * r1 + r2 * r2)
        return true;
    else
        return false;
}
 
// Driver code
int main()
{
    int x1 = 4, y1 = 3;
    int x2 = 0, y2 = 1;
    int r1 = 2, r2 = 4;
 
    bool f = orthogonality(x1, y1, x2,
                           y2, r1, r2);
 
    if (f)
        cout << "Given circles are"
             << " orthogonal.";
    else
        cout << "Given circles are"
             << " not orthogonal.";
    return 0;
}

Java




// Java program to check if two
// circ
import java.util.*;
import java.lang.*;
import java.io.*;
 
class GFG
{
    // Function to Check if the given
    // circles are orthogonal
    public static boolean orthogonality(int x1, int y1, int x2,
                                        int y2, int r1, int r2)
    {
 
        // calculating the square
        // of the distance between C1 and C2
        int dsquare = (x1 - x2) * (x1 - x2) +
                      (y1 - y2) * (y1 - y2);
 
        // Check if the given
        // circles are orthogonal
        if (dsquare == r1 * r1 + r2 * r2)
            return true;
        else
            return false;
    }
 
    // Driver Code
    public static void main(String[] args) throws java.lang.Exception
    {
        int x1 = 4, y1 = 3;
        int x2 = 0, y2 = 1;
        int r1 = 2, r2 = 4;
 
        boolean f = orthogonality(x1, y1, x2, y2, r1, r2);
 
        if (f)
            System.out.println("Given circles are orthogonal.");
        else
            System.out.println("Given circles are not orthogonal.");
    }
}
 
// This code is contributed by ashutosh450

Python3




# Python3 program to check if two
# circles are orthogonal or not
 
# Function to Check if the given
# circles are orthogonal
def orthogonality(x1, y1, x2, y2, r1, r2):
 
    # calculating the square
    # of the distance between C1 and C2
    dsquare = (x1 - x2) * (x1 - x2) + \
              (y1 - y2) * (y1 - y2);
 
    # Check if the given
    # circles are orthogonal
    if (dsquare == r1 * r1 + r2 * r2):
        return True
    else:
        return False
 
# Driver code
x1, y1 = 4, 3
x2, y2 = 0, 1
r1, r2 = 2, 4
 
f = orthogonality(x1, y1, x2, y2, r1, r2)
 
if (f):
    print("Given circles are orthogonal.")
else:
    print("Given circles are not orthogonal.")
 
# This code is contributed by Mohit Kumar

C#




// C# implementation for above program
using System;
 
class GFG
{
    // Function to Check if the given
    // circles are orthogonal
    public static bool orthogonality(int x1, int y1, int x2,
                                     int y2, int r1, int r2)
    {
 
        // calculating the square
        // of the distance between C1 and C2
        int dsquare = (x1 - x2) * (x1 - x2) +
                      (y1 - y2) * (y1 - y2);
 
        // Check if the given
        // circles are orthogonal
        if (dsquare == r1 * r1 + r2 * r2)
            return true;
        else
            return false;
    }
 
    // Driver Code
    public static void Main()
    {
        int x1 = 4, y1 = 3;
        int x2 = 0, y2 = 1;
        int r1 = 2, r2 = 4;
 
        bool f = orthogonality(x1, y1, x2, y2, r1, r2);
 
        if (f)
            Console.WriteLine("Given circles are orthogonal.");
        else
            Console.WriteLine("Given circles are not orthogonal.");
    }
}
 
// This code is contributed by AnkitRai01

Javascript




<script>
    // Javascript program to check if two
    // circles are orthogonal or not 
     
    // Function to Check if the given
    // circles are orthogonal
    function orthogonality(x1, y1, x2, y2, r1, r2)
    {
 
        // calculating the square
        // of the distance between C1 and C2
        let dsquare = (x1 - x2) * (x1 - x2)
                      + (y1 - y2) * (y1 - y2);
 
        // Check if the given
        // circles are orthogonal
        if (dsquare == r1 * r1 + r2 * r2)
            return true;
        else
            return false;
    }
       
    // Driver code
    let x1 = 4, y1 = 3;
    let x2 = 0, y2 = 1;
    let r1 = 2, r2 = 4;
   
    let f = orthogonality(x1, y1, x2,
                           y2, r1, r2);
   
    if (f)
        document.write("Given circles are orthogonal.");
    else
        document.write("Given circles are not orthogonal.");
 
// This code is contributed by divyesh072019.
</script>
Output: 
Given circles are orthogonal.

 


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