PHP CIRCLE AREA: Solve for the Area and Circumference of A Circle

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.

Formula

a = to the length of the side

r = radius of a circle

pi = 3.1415926535898

PHP Code

<?php
  $radius = 10;
  $area = pi()*pow($radius,2);
  echo "The area of the square with the side of $radius is $area";
?>

I 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.

Output

Circumference of a Circle Formula

Circumference = 2 × π × r

PHP Code

<?php
  $radius = 10;
  $circumference = 2 * pi()*$radius;
  echo "The circumference of the circle with the radius of $radius is $circumference";
?>

Output

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

echo number_format($circumference,2);

PHP CIRCLE AREA: Solve for the Area and Circumference of A Circle

PHP CIRCLE AREA: Solve for the Area and Circumference of A Circle 2016-01-27T16:46:00-08:00 Rating: 4.5 Diposkan Oleh: Emoblazz