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# C++ program to find fourth side of a quadrilateral

Suppose we have three numbers a, b and c. We want to make a closed fence in a shape of arbitrary non-degenerate simple quadrilateral. We already have three sides of length a, b and c. We have to find another side d.

So, if the input is like a = 12; b = 34; c = 56, then the output will be 42, other answers are also possible.

## Steps

To solve this, we will follow these steps −

return a + b + c - 2

## Example

Let us see the following implementation to get better understanding −

#include<bits/stdc++.h> using namespace std; int solve(int a, int b, int c){ return a+b+c-2; } int main(){ int a = 12; int b = 34; int c = 56; cout << solve(a, b, c) << endl; }

## Input

12, 34, 56

## Output

100

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