[b]This applet provides a tool to draw a custom circular scale. [br][/b][br]Toggle [icon]/images/ggb/toolbar/mode_showcheckbox.png[/icon]Hide/Show points and use the coloured points, sliders and Max input box to customize your scale.[br][b]Ticks :[/b][br][list][*]Max gives the largest weight on the scale, which goes from 0 to Max.[/*][*]MajorDiv gives the number of major divisions (+1 for the 0). Your first major division will be Max/MajorDiv.[/*][*] Use the [color=#ff7700]orange[/color] triangular dot to change the length of the ticks of the major divisions.[br][/*][*]MinorDiv gives you the number of intervals between two consecutive major divisions.[/*][*] Use the [color=#ff00ff]pink[/color] dot to change the length of these ticks.[/*][*]The red dot moves the position of the zero (and of the Max, symmetrically).[/*][/list][b]To position the labels :[/b][br][list][*] Postition the [color=#0000ff]blue dot[/color] to define teh radius of the circle [/*][*] The [color=#00ff00]green[/color] dot F is the center used for the rotation it should be close to the center but a bit on the left to get the central label right.[/*][*] Point H is used to translate the second half of the labels to the left.[/*][/list][b]To position the arrow :[/b][br][list][*]The [color=#6d9eeb]light blue triangular dot[/color] changes the radius of the arrow and the brown triangular dot at the tip of the arrow moves on the dotted circle.[/*][/list][b]Colours, size, thickness :[/b][br]By using the top right menu, you can change the color of every object (ticks, text, circles, arrow) but also the width of the lines, size of points, etc.[br][br]When you're done, hide the points and take a snapshot with the camera button. This will download a neat picture (file "scale.png") of the left view.

[size=85][color=#999999]If you don't know how to use this scale with students, ask [url=https://www.geogebra.org/u/southall.ed]Ed Southall[/url], not me :)[/color][/size]