About the Dimension Tools
Use these dimension tools to dimension Sketcher entities:
• 
Normal—Creates a linear, radial, diameter, angular, conic, or ordinate dimension. Works in Continue mode.
Normal—Creates a linear, radial, diameter, angular, conic, or ordinate dimension. Works in Continue mode.• 
Perimeter—Dimensions the total length of a chain or a loop of entities.
Perimeter—Dimensions the total length of a chain or a loop of entities.• 
Baseline—Creates linear dimension entities based on the position of the first selection. All subsequent selections are measured relative to the first selection.
Baseline—Creates linear dimension entities based on the position of the first selection. All subsequent selections are measured relative to the first selection.• 
Reference—Creates a symbolic dimension for the entity.
Reference—Creates a symbolic dimension for the entity. | Reference dimensions can be toggled to Normal dimensions. |