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# How can I find the area of a circle in C programming, PHP and C# programming languages?

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Hello Community. I am learning multiples programming languages. I want to find out the area of the circle in C programming, PHP programming, and C# programming languages. How can I get the area of circle these programming languages?

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That's a really great idea if you want to compare three programming languages with the same example. If you want to get the area of the circle using C programming, PHP programming, and C# programming, you should understand the area of a circle formula. The mathematics formula for areal of the circle - A = π r2

π - Pai

The value of π= 3.14

The area of the circle can be written as pai*r*r in C, PHP, and C# programming.

## Find the area of the circle in C programming -

C programming is known as the computer programming language. This is the base of all programming languages. If you want to learn any programming language,

you should understand the C language first.

You can find out the area of the circle in C language by creating variables and multiplication.

``````#include<stdio.h>
#include<math.h>
main()
{
float r=2.0;

float pai=3.14;

float a;

a = pai*r*r;

printf("Area of circle = %.2f\n", a);
}``````

Execute the above C language example and change the radius of the circle.

Let's find out the area of the circle in PHP.

## Area of the circle in PHP programming -

``````<?php
\$pai=3.14;
\$r=2.0 ;
\$a=\$pai*\$r*\$r;
echo(\$a);
?>``````

In PHP, variables are declared with the dollar \$ sign.

## Get the area of the circle in C# programming -

C# programming is another programming language based on C and C++ concepts. You can find out the area of a circle using the C# language.

``````public class areaOfCircle{

public static void Main(){

double pai ,a,r;

pai=3.14;

r=2.0;

a=pai*r*r;

System.Console.WriteLine(a);

}

}`````` Comment

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0

Thanks for the question. The solution is very easy. You should understand the basic things to find out the area of the circle using C, PHP, and C# programming languages.

Area of the circle =  π r

The value of the π = 3.14

r2= r*r;

You need to create three variables.

Follow the best solution reference and change according to your need -

PHP: Add two input box values and sum in the third box

Mathematics operations in C# programming

Area of the circle in C language -

``````#include<stdio.h>
#include<math.h>
main()

{

float p=3.14;

float area;

printf("Area of the circle = %.2f\n", area);

}`````` Comment