Returns the approximate circumference of the ellipse defined by the specified minor and major axes. - Java java.lang

Java examples for java.lang:Math Function

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Description

Returns the approximate circumference of the ellipse defined by the specified minor and major axes.

Demo Code

// Copyright (C) 2002-2012 Three Rings Design, Inc., All Rights Reserved
//package com.java2s;

public class Main {
    /**/*from  www  . j a v a  2  s .c o m*/
     * Returns the approximate circumference of the ellipse defined by the specified minor and
     * major axes. The formula used (due to Ramanujan, via a paper of his entitled "Modular
     * Equations and Approximations to Pi"), is <code>Pi(3a + 3b - sqrt[(a+3b)(b+3a)])</code>.
     */
    public static double ellipseCircum(double a, double b) {
        return Math.PI
                * (3 * a + 3 * b - Math.sqrt((a + 3 * b) * (b + 3 * a)));
    }
}

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