# C Program to Find the Perimeter of a Circle, Rectangle and Triangle

This is a C Program to find the perimeter of a circle, rectangle and triangle.

Problem Description

This C Program calculates the perimeter of a circle, rectangle and triangle.

Problem Solution

This program is used to find the perimeter of a circle, rectangle and triangle. The formula used in this program are
perimeter of rectangle: 2 * (a + b)
perimeter of General triangle: a + b + c
perimeter of Equilateral triangle: 3 * a
perimeter of Right angled triangle: width + height + sqrt(width ^ 2 + height ^ 2)
perimeter of circle: 2 * pi * r

Program/Source Code

Here is source code of the C Program to Find the perimeter of a circle, rectangle & triangle.The C program is successfully compiled and run on a Linux system. The program output is also shown below.

```/*
* C Program to Find the Perimeter of a Circle, Rectangle and Triangle
*/
#include <stdio.h>
#include <math.h>

int main()
{
float radius, length, width, a, b, c, height;
int n;
float perimeter;

//Perimeter of rectangle
printf(" \n Perimeter of rectangle \n");
printf("---------------------------\n");
printf("\n Enter width and length of the rectangle : ");
scanf("%f%f", &width,& length);
perimeter = 2 * (width + length);
printf("Perimeter of rectangle is: %.3f", perimeter);

//Perimeter of triangle
printf("\n Perimeter of triangle n");
printf("---------------------------n");
printf("\n Enter the size of all sides of the triangle : ");
scanf("%f%f%f", &a, &b, &c);
perimeter = a + b + c;
printf("Perimeter of triangle is: %.3f", perimeter);

//Perimeter of circle
printf(" \n Perimeter of circle \n");
printf("---------------------------\n");
printf("\n Enter the radius of the circle : ");
perimeter = 2 * (22 / 7) * radius;
printf("Perimeter of circle is: %.3f", perimeter);

//Perimeter of equilateral triangle
printf(" \n Perimeter of equilateral triangle \n");
printf("---------------------------\n");
printf("\n Enter any side of the equilateral triangle : ");
scanf("%f", &a);
perimeter = 3 * a;
printf("Perimeter of equilateral triangle is: %.3f", perimeter);

//Perimeter of right angled triangle
printf(" \n Perimeter of right angled triangle \n");
printf("---------------------------\n");
printf("\n Enter the width and height of the right angled triangle : ");
scanf("%f%f", &width, &height);
perimeter = width + height + sqrt(width * width + height * height);
printf("Perimeter of right angled triangle is: %.3f", perimeter);
return 0;
}```
Program Explanation

This C program is used to find the perimeter of a circle, rectangle and triangle. We are reading the value for ‘width’ and ‘length’ variables respectively. Compute the perimeter of a rectangle. The following formula is used

Perimeter = 2* (width + length).

We are reading the values for ‘a’, ’b’, ‘c’ variables respectively. Compute the perimeter of the triangle, the following the formula is used.

Perimeter = a + b + c.

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We are reading the value for ‘radius’ variable. Compute the perimeter of circle, the following formula is used

Perimeter = 2 * (22/7) * radius.

We are reading the value for ‘a’ variable. Compute the perimeter of a equilateral triangle, the following formula is used.

Perimeter = 3 * a.

We are reading the values for ‘width’ and ‘height’ variables respectively. Compute the
perimeter of Right angled triangle, the following formula is used

Perimeter = width + height + sqrt((width * width) + (height * height)).

Runtime Test Cases
```
Output:
\$ cc pgm32.c -lm
\$ a.out
Perimeter of rectangle
---------------------------

Enter width and length of the rectangle : 12 13
Perimeter of rectangle is: 50.000

Perimeter of triangle
---------------------------

Enter the size of all sides of the triangle : 12 16 18
Perimeter of triangle is: 46.000

Perimeter of circle
---------------------------

Enter the radius of the circle : 10
Perimeter of circle is: 60.000

Perimeter of equilateral triangle
---------------------------

Enter any side of the equilateral triangle : 19 34
Perimeter of equilateral triangle is: 57.000

Perimeter of right angled triangle
---------------------------

Enter the width and height of the right angled triangle : 5 7
Perimeter of right angled triangle is: 73.366```

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If you wish to look at other example programs on Mathematical Functions, go to C Programming Examples on Mathematical Functions. If you wish to look at programming examples on all topics, go to C Programming Examples.

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