phpOMS/Math/Shape/D2/Circle.php

<?php
/**
 * Orange Management
 *
 * PHP Version 7.0
 *
 * @category   TBD
 * @package    TBD
 * @author     OMS Development Team <dev@oms.com>
 * @author     Dennis Eichhorn <d.eichhorn@oms.com>
 * @copyright  2013 Dennis Eichhorn
 * @license    OMS License 1.0
 * @version    1.0.0
 * @link       http://orange-management.com
 */
namespace phpOMS\Math\Algebra;

class Circle
{

    /**
     * Area
     *
     * @param float $r Radius
     *
     * @return float
     *
     * @since  1.0.0
     * @author Dennis Eichhorn <d.eichhorn@oms.com>
     */
    public static function getArea(\float $r)
    {
        return pi() * $r ** 2;
    }

    /**
     * Circumference
     *
     * @param float $r Radius
     *
     * @return float
     *
     * @since  1.0.0
     * @author Dennis Eichhorn <d.eichhorn@oms.com>
     */
    public static function getCircumference(\float $r)
    {
        return 2 * pi() * $r;
    }

    /**
     * Radius
     *
     * @param float $area Area
     *
     * @return float
     *
     * @since  1.0.0
     * @author Dennis Eichhorn <d.eichhorn@oms.com>
     */
    public static function getRadiusByArea(\float $area)
    {
        return sqrt($area / pi());
    }

    /**
     * Radius
     *
     * @param float $C Circumference
     *
     * @return float
     *
     * @since  1.0.0
     * @author Dennis Eichhorn <d.eichhorn@oms.com>
     */
    public static function getRadiusByCircumference(\float $C)
    {
        return $C / (2 * pi());
    }
}