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<p> If you started your square from the origin (0,0 on the sketch plane), you will notice that the two lines touching the origin are constrained (denoted by a black color). Conversely, the two lines not touching the origin are not constrained (denoted by a blue color). Constraints are characteristics of your sketch objects that limit movement and change. For example, if I give a line a vertical constraint, no further actions will change the orientation of that line. It will remain vertical. Logically, a sketch or shape is fully constrained when there can be no movement in the 2D space from further actions. Any attempt to move the sketch will move the entirety as long as it is not constrained to the origin. In order to learn the specifics of constraints (highly recommended) please visit the [[Constraints|Constraints Wikipage]].
<h3> Specifying Dimensions </h3>
In order to change the dimension of a sketch curve, press D and then click on the line (or two lines to measure the space between) you want to size. Note that this adds a specific size constraint not shown in the sketch palette. You can input a dimension in a few different ways. # Apply constraintsEnter another dimension in the form of d1 or d2 to make a dependent dimension # Enter a math expression # Enter a number Although the unit shown on the dimensions are determined by the settings, you are able to input any unit in a dimension. For example, I can input "10 in" for a dimension and it would change to the equivalent 254 mm by default. In order to complete a sketch, click the "Finish sketchSketch" button on the tool bar.
== Extruding a sketch ==
