phpOMS/Math/Geometry/Shape/D2/Circle.php

<?php
/**
 * Orange Management
 *
 * PHP Version 7.1
 *
 * @category   TBD
 * @package    TBD
 * @copyright  Dennis Eichhorn
 * @license    OMS License 1.0
 * @version    1.0.0
 * @link       http://orange-management.com
 */
declare(strict_types=1);

namespace phpOMS\Math\Geometry\Shape\D2;

/**
 * Circle shape.
 *
 * @category   Framework
 * @package    phpOMS\DataStorage\Database
 * @license    OMS License 1.0
 * @link       http://orange-management.com
 * @since      1.0.0
 */
class Circle implements D2ShapeInterface
{

    /**
     * Area
     *
     * @param float $r Radius
     *
     * @return float
     *
     * @since  1.0.0
     */
    public static function getSurface(float $r) : float
    {
        return pi() * $r ** 2;
    }

    /**
     * Circumference
     *
     * @param float $r Radius
     *
     * @return float
     *
     * @since  1.0.0
     */
    public static function getPerimeter(float $r) : float
    {
        return 2 * pi() * $r;
    }

    /**
     * Radius
     *
     * @param float $surface Surface
     *
     * @return float
     *
     * @since  1.0.0
     */
    public static function getRadiusBySurface(float $surface) : float
    {
        return sqrt($surface / pi());
    }

    /**
     * Radius
     *
     * @param float $C Circumference
     *
     * @return float
     *
     * @since  1.0.0
     */
    public static function getRadiusByPerimeter(float $C) : float
    {
        return $C / (2 * pi());
    }
}