If you're using OneNote for Windows 10 on touch device, you can use the Ruler on the Draw tab of the Ribbon to draw straight lines or to measure distance. The ruler pivots to any position you want: horizontal, vertical, or any angle in between. It has a degrees setting so that you can set it at a precise angle, if necessary. You can manipulate the ruler by using your fingers.
: The Ruler feature is available only on OneNote for Windows 10 installed on a touch device, such as a Surface tablet or other touch-enabled device.
Draw a line
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Select the page where you want to use the ruler.
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Tap the Ruler
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Position the ruler at the angle you want.
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Use one finger to move the ruler up/down or left/right.
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Use two fingers to rotate the ruler to the angle you want.
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Use three fingers to rotate the ruler by five-degree increments.
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Tap a pen or highlighter on the Draw tab, and begin drawing.
Hide the ruler
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Tap the Ruler
