Area and Circumference of a Circle in C | 400+ Questions & Answers

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Write a Program to Find Area and Circumference of a Circle in C Language

We have a programming challenge to find an Area and Circumference of a Circle, so before going to write a solution in C, we need to know some facts about the circle, Ie. Area of a circle, Radius of Circle, Diameter of Circle, and Circumference of Circle. We will discuss each point step by step with the help of pictures.

What we are going to learn in this article, below is a list.

Area and Circumference of a Circle- Table of Content

  • What is Circle
  • Radius of Circle
  • Diameter of Circle
  • Area of a Circle, and
  • Circumference of Circle
  • Explanation of the Problem
  • Programming Code in C Language
  • The Output of the C Program
  • What is Circle

What is Circle

A circle is a rounded closed shape, with no corner, and no edges. Where all the points in plan are at the same distance from its centre.

How to Draw a Circle

How to Draw a Circle GIF Tutorials

Radius of Circle

Radius is the distance from the centre of the circle to any point on its circumference.

Diameter of Circle

Diameter is nothing but the biggest line in Circle. It’s very easy to calculate the diameter of a circle, just double the radius of the circle. We can find a radius of a circle by given formula.

Formula: Diameter = 2 * Radius.

Circle Center, Radius, and Diameter Draw GIF Tutorials

Area of a Circle

The area is a space covered by a circle, Circle area is dependent on its radius. We can calculate the area of the circle by given formula.

Formula to Find Area of a Circle

Area of a Circle = πr2 or PI * Radius * Radius.

Here PI value is fixed which is 22/7 or 3.1415926535, but for this problem, we are using a PI value up to 5 decimal digits, If you want to know more about PI click here. You can find the PI value up to 1,00,000 Decimal Digits.

Circumference of Circle

The circumference is a Latin word which means in English “Carrying Around” on in Hindi “परिधि“. The circumference is a fixed or linear distance around it. In other words, we can say that the length of the circle if it were opened up and straightened out to a line segment. Below GIF clear your all doubts.

Formula to Find Circumference of a Circle

Circumference of Circle = 2πr or 2 * PI * Radius

Circumference of a Circle GIF Tutorials

Explanation of the Problem

Now we have both formulas(Area and Circumference), We just need to put the R or Radius value in the both given Formula.

Example 1: Radius of a Circle

Suppose the value of the Radius is 10.5, now put the same value in the formula. We already know the PI value which is 3.14159

Area of Circle = πr2 or PI * Radius * Radius.

Area of Circle = 3.14159 * 10.5 *10.5 = 346.360291

Circumference of Circle = 2πr or 2 * PI * Radius

Circumference of Circle = 2 * 3.14159 * 10.5 = 65.973389

So here is a Final answers we got Area of Circle is = 346.360291 and Circumference is = 65.973389.

C Program to Find Area and Circumference of a Circle

#include<stdio.h>

int main() {
  /* 
  "Area and Circumference of a Circle is C". This Programming Solution is belong to 
  Simple Categories in C Language. -by Tutorials BookMaarks.
  Visit Here: https://tutorialsbookmarks.com/c-programming-questions-answers-pdf-download/
  */
  float radius, area_of_circle, circumference_of_circle;
  float PI = 3.14159;

  printf("Enter the Radius of Circle: ");
  scanf("%f", & radius);

  area_of_circle = PI * radius * radius;
  printf("\n\nArea of Circle is = %f ", area_of_circle);

  circumference_of_circle = 2 * PI * radius;
  printf("\n\nCircumference of Circle is = %f \n", circumference_of_circle);

  return (0);
}

Output

C Program Output for Area and Circumference of a Circle

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