Write a C Program to input two angles of a triangle 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.

**Example**

**Input**

Enter first angle: 60 Enter second angle: 80

**Output**

Third angle = 40

## Required knowledge

Fundamentals of C, Data types, Talking user input in C

## Properties of triangle

We know that sum of all angles of a triangle is 180° .

Hence, by applying basic mathematics we can easily deduct a formula for finding the third angle. The formula for third angle is given by -

## Logic to find third angle of a triangle

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

- Read two angles of the triangle from user and store it in some variable say a and b.
- Now, apply the formula for finding third angle. Which is c = 180 - (a + b).
- Print the value of c. Which is the required third angle of the triangle.

## 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); // Calculate the third angle c = 180 - (a + b); // Print the value of third angle printf("Third angle of the triangle = %d", c); return 0; }

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

Happy coding ;)

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ReplyDeleteOutline:

• Language: C and Simscript.

• if (Condition) statement and Nested if statement is used to determine the given number is positive, negative, even or odd. Another way we solve this program using if-else-if ladder.

• When the given condition or expression is true the statement associated with it executed.

To know details:

http://www.secufoon.com/write-a-c-program-for-determining-a-number-is-positive-negative-even-or-odd/