Graphs of circles

The equation for a circle is  x2 + y2 = r2    To draw one manually, set the drop-down box type of equation  to square root of a polynomial, and set parameter b to -1 and parameter d to the square of the radius. You will need to set the ranges of x and y to negative and positive values greater than the radius.

This demonstration draws 8 concentric circles with radii ranging from 24 to 108, and plays a MIDI note whose MIDI pitch number equals the radius.  Midi note 24 is 3 octaves below middle C, 60 is middle C and the highest note, at radius 108, is 4 octaves above middle C.


Circular.htm     02 November 2006         MENU  Theory -> Maths and Physics -> Mathematical equations for music