# Difference between revisions of "Lituus"

From JSXGraph Wiki

Jump to navigationJump to searchA WASSERMANN (talk | contribs) |
A WASSERMANN (talk | contribs) |
||

Line 1: | Line 1: | ||

− | A lituus is a spiral in which the angle is inversely proportional to the square of the radius (as expressed in polar coordinates). | + | A '''lituus''' is a spiral in which the angle is inversely proportional to the square of the radius (as expressed in polar coordinates). |

:<math>r^2\theta = k \,</math> | :<math>r^2\theta = k \,</math> |

## Revision as of 10:09, 18 March 2009

A **lituus** is a spiral in which the angle is inversely proportional to the square of the radius (as expressed in polar coordinates).

- [math]r^2\theta = k \,[/math]

### The JavaScript code to produce this picture

```
<jsxgraph width="500" height="500" box="box1">
b1 = JXG.JSXGraph.initBoard('box1', {axis:true,originX: 250, originY: 250, unitX: 25, unitY: 25});
var k = b1.createElement('slider', [[1,8],[5,8],[0,1,4]]);
var c = b1.createElement('curve', [function(phi){return Math.sqrt(k.Value()/phi); }, [0, 0],0, 8*Math.PI],
{curveType:'polar', strokewidth:4});
</jsxgraph>
```