Overview of relations

The relations of the geometric constraints that can be applied to sketch elements, in addition to dimensional constraints, will allow you to quickly obtain the shape you wish to model.

The table below lists the characteristics of each relation:

Name	Icon Symbol	Reference element	Result
Perpendicularity		A line and a circle or a circle arc.	The angle between the two elements is equal to 90°.
Concentricity		Two circles or two circle arcs.	The centers of the elements become coincident.
Tangency		A line and a circle or a circle arc.	The two elements are tangent.
Orientation		One line.	The line is pivoted to the closest horizontal or vertical.
Alignment		Two points.	The two points are moved to the closest horizontal or vertical.
Coincidence		Two points. A point and a line, an arc, a circle or an edge. Two lines.	The points are superposed. The point is placed on the element or in its extension. The lines are placed collinearly.
Centering		Two elements (points or lines) and a line (axis).	The two elements are moved equidistant in relation to the axis .
Parallelism		Two lines.	The two lines are oriented in the same direction.
Intersection		A point and two elements (lines, circles or circle arcs).	The point is moved at the intersection of the two elements.
Equality		Two lines.	The length of the two lines becomes equal.
Fixity		Any type of element.	The element's position cannot be modified. In the case of a line or an arc, the ends can be moved along the line or the arc.
Translated		Any type of element, except points.	Elements are constrained dimensionally. This constraint is automatically added by the Translated command.

Automatic Relations

Likewise, the choice of the sketch's origin during creation of an element automatically creates a fixity relation.

It is also possible to quickly create a tangency constraint between a line and an arc by selecting the line or the arc near the tangency point, then by moving it until the tangency symbol display is obtained.

The relations display can be activated or not by changing the Show relations mode.