Even when you are in the middle of a task, you can measure distances using Measure Distance. For example, consider the following workflow.
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On the Draw toolbar, select Line/Arc Continuous and draw a line.
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Click Tools > Measure Distance and measure a distance.
You do not need to exit Line/Arc Continuous before measuring a distance.
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Right-click to exit Measure Distance. Line/Arc Continuous is still active—you can pick up where you left off and continue using Line/Arc Continuous.