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Click Tools > Measure Explicit Command to display the Measure Explicit Ribbon.
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On the ribbon, click Define Coordinate System by 3 Points .
The ribbon temporarily disappears.
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Click the first point to define the origin of the coordinate system.
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Click the second point to define the end of the local X-axis.
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Click the third point to define the end of the local Y-axis.
The ribbon reappears. Temporary appears as the value in the Coordinate System box.
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Follow the status bar prompts to begin measuring.
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Right-click to quit the Measure Explicit command.