# C program to find angles of triangle if two angles are given

Write a C Program to input two angles from user and find third angle of the triangle. How to find all angles of a triangle if two angles are given by user using C programming. C program to calculate the third angle of a triangle if two angles are given.

ExampleInput

```Enter first angle: 60
Enter second angle: 80```

Output

`Third angle = 40`

## Properties of triangle

Sum of angles of a triangle is 180°.

Let us apply basic math to derive formula for third angle. If two angles of a triangle are given, then third angle of triangle is given by -

## Logic to find third angle of a triangle

Step by step descriptive logic to find third angle of a triangle -

1. Input two angles of triangle from user. Store it in some variable say a and b.
2. Compute third angle of triangle using formula `c = 180 - (a + b)`.
3. Print value of third angle i.e. print c.

## Program to find angles of a triangle

``````/**
* C program to find all angles of a triangle if two angles are given
*/

#include <stdio.h>

int main()
{
int a, b, c;

/* Input two angles of the triangle */
printf("Enter two angles of triangle: ");
scanf("%d%d", &a, &b);

/* Compute third angle */
c = 180 - (a + b);

/* Print value of the third angle */
printf("Third angle of the triangle = %d", c);

return 0;
}``````

Output

```Enter two angles of triangle: 60 30
Third angle of the triangle = 90```

Happy coding 😉

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