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Click Tools > Measure to display the Measure Ribbon.
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Click Measure Distance Along Element .
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Select the object or object edge to measure along. The edge you select can be straight or curved.
The edge highlights, and the software prompts you to click a reference point along the edge from which to measure.
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Click the reference point, or press A to measure the whole object length.
The software prompts you to select a point along the edge to which to measure.
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Click the point to measure to.
The distance between the two points displays.