The Dimension command adds dimensions to a sketch. Dimensions control the size of a part. They can be expressed as numeric constants, as variables in an equation, or in parameter files.
Access
Ribbon:
Sketch tab
Constrain panel
Dimension
Using the Dimension command, you can place the following types of dimensions:
Linear dimension from one element.
Linear dimension between two elements.
Aligned dimension between two elements.
Angular dimension between two edges.
Angular dimension between three points.
Angular dimension of an interior angle.
Angular dimension of an exterior angle.
Angular dimension from a reference line.
Radial dimension.
Diameter dimension.