To measure a single entity: |
Select the entity in the graphics area.

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To measure the distance between two arcs or circles: |
Select two arcs or circles and click Arc/Circle to set the options. To use the arc/circle options, point-to-point mode must be disabled.
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To measure the smallest distance between two entities: |
Select each entity on the model.

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To measure the distance between two points: |
Click Point-to-Point and select two points on the model. |