Though you can easily hide or show objects using Hide/Show buttons, sometimes you may want objects to appear or disappear based on a calculation or measurement in the sketch. I've just added some tools that make it easier to do this. To use the tools, first calculate a Boolean value (0 for false, 1 for true) to indicate whether an object should exist or not. Then use one or another of the tools to create a point, a text object, or some other object whose existence depends on whether the value is true or false.

The tools are here:
http://sketchexchange.keypress.com/s...and-text-tools

To make it easy to work with Boolean values, download the Boolean tools here:
http://www.dynamicgeometry.com/Gener...oolean%20Tools