# Constraints Defined in Dialogue Box Tool

There are many constraints that are available to use on your sketch, each with different functions.
Constraints are imposed onto sketches to ensure that the profile does not change when one of its dimensions is altered.

Distance – the offset between 2 geometries

Length – determines the length of specific geometry

Angle – the angle between 2 selected elements

Semimajor axis – dimensions the length of the major axis of an ellipse

Semiminor axis – dimensions the length of the minor axis of an ellipse

Symmetry – makes sure the object is symmetrical about an axis selected. You have to select the 2 objects that will be in symmetry with one another first then select the axis of symmetry. Remember to hold the Ctrl key!

Midpoint – constrains an existing point to the centre of a line

Equidistant Point – moves an existing point to a position where it is the same point from existing geometry. The order in which the geometry is selected is important; first the two lines have two be selected before the point

Fix – prevents the selected geometry from translating

Coincidence – moves the objects so that they are in line

Concentricity – moves the point to the centre of the circle

Tangency – moves lines to make them tangential to existing geometry

Parallelism – makes two lines parallel

Perpendicular – makes two lines perpendicular

Horizontal – Creates a line that is horizontal

Vertical – Creates a line that is vertical