In SolidWorks, there are several types of geometric relations that can be used to define the relationship between different entities in a 3D model. These geometric relations help ensure that the model remains fully defined and allows for easy modifications and changes.

## Parallel

**Parallel** is a type of geometric relation that ensures two lines or edges in a sketch or a 3D model remain equidistant at all points. To apply this relation, simply select the two lines or edges and use the ‘Parallel’ relation from the toolbar or the context menu.

## Perpendicular

**Perpendicular** is another important geometric relation that defines a 90-degree angle between two lines or edges. This relation is commonly used to create right angles in sketches or models. To apply this relation, select the two lines or edges and use the ‘Perpendicular’ option from the toolbar or context menu.

## Tangent

**Tangent** is a geometric relation that ensures smooth contact between curves and edges. When two curves are tangent, they share a common point of contact without intersecting each other. To apply this relation, select one curve and one edge, then use the ‘Tangent’ option from the toolbar or context menu.

## Concentric

**Concentric** is a geometric relation used to define circles, arcs, or ellipses with a common center point. When applied, these entities will always share the same center point. To apply this relation, select two circles, arcs, or ellipses and choose the ‘Concentric’ option from the toolbar or context menu.

## Coincident

**Coincident** is a geometric relation that ensures two points or entities share the same location in space. This relation is commonly used to align sketch entities or features. To apply this relation, select two points or entities and use the ‘Coincident’ option from the toolbar or context menu.

## Midpoint

**Midpoint** is a geometric relation used to define the center point of a line or an arc. When applied, this relation ensures that the selected point remains at the midpoint of the selected line or arc. To apply this relation, select a line or an arc and use the ‘Midpoint’ option from the toolbar or context menu.

## Angle

**Angle** is a geometric relation that defines an angle between two lines, edges, or sketch entities. This relation allows you to specify precise angles for construction and design purposes. To apply this relation, select two lines, edges, or sketch entities and choose the ‘Angle’ option from the toolbar or context menu.

### In Conclusion

In SolidWorks, there are several types of geometric relations that help define and control the relationships between different entities in a 3D model. These relations include parallel, perpendicular, tangent, concentric, coincident, midpoint, and angle. By using these geometric relations effectively, you can create well-defined models that are easy to modify and update.