**The Program in **C**++ to Find the third angle of a Triangle is given below:**

```
#include <iostream>
using namespace std;
int main() {
double angle1, angle2, angle3;
cout << "Enter first angle of the triangle: ";
cin >> angle1;
cout << "Enter second angle of the triangle: ";
cin >> angle2;
angle3 = 180 - angle1 - angle2;
cout << "Third angle of the triangle: " << angle3 << endl;
return 0;
}
```

## Output:

Enter first angle of the triangle: 45

Enter second angle of the triangle: 89

Third angle of the triangle: 46

## Pro-Tips**💡**

In this program, the user is prompted to enter the first and second angles of the triangle.

These angles are then stored in the variables `angle1`

and `angle2`

.

The third angle is then calculated using the formula `angle3 = 180 - angle1 - angle2`

,

which is based on the fact that the sum of the angles of a triangle is always 180 degrees.

The resulting third angle is then displayed on the screen.

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