Constant is a global named value which can be used anywhere in you formulas throughout a project. Constants belong to the current project and they will not be available in other .gs documents. When defining a new constant you can type any mathematical expressions for it's value. Changing a constant's value affects all the graphics involving it in their formulas.
You can create, delete and modify constants through Constants dialog box which appears when you click View|Constants command.
Constants Dialog box
To add or delete a constant right click the grid for the shortcut menu with Insert and Delete options or use the aproppriate buttons. You may also use Ins and Del keys instead. Note, that a constant cannot be deleted if it is used somewhere in your project (for example when some function that is being plotted depends on it).
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