# Basic C Exercises

**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.

**Required knowledge**

C Operators,
Data Types in c,
Basic input/output
**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 -

formula for third angle of a triangle

**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