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On the toolbar, select the linear object to contain the measurements.
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Click Measure Distance Along ..
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Click a point or click a key point on the linear object as the first input. This identifies the measurement starting point.
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Click the second input point or key point to end the measurement. The distance between the two points appears next to the pointer.
For closed shapes (curves, circles, ellipses), the measurement defaults to a clockwise direction. You can hold the CTRL key to change the measurement direction to counterclockwise.