Try it!
Add detail to your diagrams by showing the size of shapes or the distance between two points.
Find and open the measure tools
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              Select More Shapes > Visio Extras > Drawing Tool Shapes. 
Measure lengths and distances
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              Select the Measure tool shape you want and place it near the area you want to measure. 
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              Place the endpoint of the Measure tool shape to a point you want to measure from. Note:Â The endpoint turns green when the shape's ready to use. 
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              Select the other endpoint and drag the Measure tool shape where you want to measure to. Tip:Â Use the Horizontal measure shape or the Vertical measure shape if you want the measurements to align with the horizontal or vertical axes on the grid. 
 
                         
				 
				