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