Area solver for shapes is just one of the exercises given by most programming instructors. Some other exercises are the following:

1. Celsius to Fahrenheit Temperature Converter

2. Identify if odd or even number

3. Display numbers using a for loop

4. Solve for the area of a triangle

5. Fibonacci Series

Area is the size of the surface of an object. In this article, we will discuss about the formula and

**php code**in solving for the

**area of a circle**.

**Try PHP Circle Area Live Here!**

**Formula area of circle**

a = to the length of the side

r = radius of a circle

pi = 3.1415926535898

**PHP Code**

<?phpI used the pi() function but you can also declare a variable with the value of 3.1415926535898. The pow() function is used to express exponential values. Let's say pow($radius,2) means the value of $radius will be raised to 2 with the value of 10 for the $radius.

$radius = 10;

$area = pi()*pow($radius,2);

echo "The area of the square with the side of $radius is $area";

?>

**Output area of circle**

**Circumference of a Circle Formula**

Circumference = 2 × Ï€ × r**PHP Code circumference of a circle**

<?php

$radius = 10;

$circumference = 2 * pi()*$radius;

echo "The circumference of the circle with the radius of $radius is $circumference";

?>

**Output circumference of a circle**

If you want your output to be formatted in 2 decimal places, just do it this way.

echo number_format($circumference,2);

Thank you for visiting and hope this helps you. Feel free to leave a comment below for any questions. I got some other articles related to php and mysql here in my blog. Watch out for more upcoming tutorials related to blogging and programming. Good day! ^_^

## No comments:

## Post a Comment