### Adding Geometric Relations*:

- Click **Add Relation** under Display/Delete Relations – OR – select** Tools / Relations / Add**.

- Select the 4 lines shown below.

- Click **EQUAL** from the Add Geometric Relation dialog box. This relation makes the length of the two selected lines equal.

* Geometric relations are one of the most powerful features in Solid Works. They’re used in the sketch level to control the behaviors of the sketch entities when they are moved or rotated and to keep the associations between one another.

When applying geometric relations between entities, one of them should be a 2D entity and the other can either be a 2D sketch entity or a model edge, a plane, an axis, or a curve, etc.

Geometric relations can be created manually or automatically. The next few steps in this chapter will demonstrate how geometric relations are added manually.

### Adding a Collinear relation**:

- Select the** Add Relation ** command again.

- Select the 3 lines as shown below.

- Click **COLLINEAR** from the Add Geometric Relations dialog box.

- Click** OK
**

** Collinear relations can be used to constrain the geometry as follow:

- Collinear between a line and another line(s) (2D and 2D).

- Collinear between a line(s) to an edge of a model (2D and 3D).

**Geometric Relations Examples**