Click Smart Dimension (Dimensions/Relations toolbar) or Tools > Dimensions > Smart with the model view normal to the annotation view.
Select Reference dimension in the Dimension PropertyManager.
In the graphics area, pick the chamfer's silhouette edge.
Click View > Hide/Show > Annotations on the Annotation toolbar, or click View > Hide/Show > Annotations on the View menu. All annotations are visible; annotations that are concealed are greyed out. To show or hide annotations, click the checkboxes next to them.
Text and symbols are used to add information to drawings as annotations. There are arrowheads, leaders, and text in several annotations. In each type of SOLIDWORKS document, annotations function like dimensions.
Right-click an annotation view in the FeatureManager design tree and select Edit Annotation View. To change the horizontal direction, select a drawing, edge, or face. Turns the annotation view 180 degrees. To change the annotation view, type a value or adjust the slider.
With the Smart Dimension tool, you can dimension 2D or 3D sketch things. While the Smart Dimension tool is active, you can move or delete a dimension.