How to Smart Dimension an Angle in SOLIDWORKS

You can dimension an angle in SOLIDWORKS with the Smart Dimension tool by selecting two lines, edges, construction lines, or reference entities. The angle dimension controls or documents the angle between those selected entities.

Add an angle dimension in a sketch

1. Edit the sketch.
2. Choose Smart Dimension.
3. Select the first line or edge.
4. Select the second line or edge.
5. Move the cursor to the side that shows the angle you want.
6. Click to place the dimension and enter the value.

The preview changes as you move the cursor. If SOLIDWORKS shows the supplementary angle instead of the angle you want, move the cursor to another side of the selected lines before placing the dimension.

Use construction lines when needed

If the geometry does not have a convenient second line, add a construction line. For example, a horizontal or vertical construction line can give you a clean reference for a sloped sketch entity.

Construction geometry keeps the angle dimension readable without adding extra model edges. Fully define the construction line so the angle behaves predictably when the sketch changes.

Dimension the angle you really need

Angles can be shown as acute, obtuse, or supplementary values depending on where the dimension is placed. Before accepting the value, confirm that the dimension controls the intended side of the sketch.

If the sketch flips when you edit the value, add supporting relations or dimensions. Angle dimensions work best when the rest of the sketch has enough constraints to prevent ambiguous motion.

Use angle dimensions in drawings

In a drawing, Smart Dimension can also document an angle between model edges or sketch entities. Select the two edges, place the dimension where it is easy to read, and check that the drawing view orientation makes the angle clear.

Troubleshooting

If SOLIDWORKS will not create the angle, check that the selected entities are valid and not parallel in a way that prevents the intended dimension. If the wrong value appears, move the cursor before placing the dimension or select the entities in a different order.