Measure length of edge
To measure the length of an edge:
1. Click Analysis and then, in the Measure group, click the arrow next to 
Distance.
Distance.2. Click 
Edge Length. The Measure Output and Distance dialog boxes open.
Edge Length. The Measure Output and Distance dialog boxes open.3. Click an edge on the object. The viewer displays the length of the selected edge in the Distance Output box.
4. You can click further measure options, or click 
to complete the operation.
to complete the operation.