Sketch Relations Overview

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In SolidWorks, relations between sketch entities and model geometry, in either 2D or 3D sketches, are an important means of building in design intent. For example:

Sketch two circles using the Circle and Perimeter Circle tools to create tangency.
Sketch two concentric circles and add a Concentric relation.

You can add relations in the following ways:

As you sketch, allow the SolidWorks application to automatically add relations. Automatic relations rely on:

Inferencing
Pointer display
Sketch Snaps and Quick Snaps

After you sketch, manually add relations using the Add Relations tool, or edit existing relations using the Display/Delete Relations tool.

Equations create mathematical relations between model dimensions, but outside of sketches.

To place a hole in the center of a block:

Use Sketch Snaps to locate the midpoint of each edge.	Use inferencing to create intersecting perpendicular centerlines.
To create tangent circles:
Sketch the first circle using the Circle tool. Sketch the second circle using the Perimeter Circle tool. Use the tangent icon to place the pointer and sketch the second circle.
To use relations to maintain design intent:

Sketch two concentric circles.	Add Concentric relation. Circles move together.

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