find the area of a sector of a circle in php

To find the area of a sector of a circle in PHP, we need to know the radius of the circle and the angle (in radians) of the sector. We can then use the following formula:


main.php
$area = ($angle / (2 * pi())) * pow($radius, 2);
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where $angle is the angle of the sector in radians, and $radius is the radius of the circle.

Here's an example function that uses this formula to calculate the area of a sector:


main.php
function sector_area($radius, $angle) {
    return ($angle / (2 * pi())) * pow($radius, 2);
}
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We can then call this function with the radius and angle of our sector to get the area:


main.php
$radius = 5; // set radius to 5
$angle = pi() / 2; // set angle to 90 degrees (in radians)
$area = sector_area($radius, $angle); // calculate the area of the sector

echo "The area of the sector is: " . $area;
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This will output:


main.php
The area of the sector is: 6.25
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