Perimeter Tool
Select to open the Perimeter Tool floating window. First select options in the Settings and Markup panels, and then draw a set of lines or a closed shape over a PDF object whose perimeter you want to measure. See Measure perimeter of a polygon or connected lines for details.
View tab
The View tab displays the current value of the measurement and the cursor location.
Measurement:
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Distance: As you draw the current section of a set of lines, the length is displayed dynamically.
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Angle: Shows the angle of the first line section related to the X axis; for subsequent line sections, it shows the angle relative to the previous section. No signs or directions of rotation are considered.
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Perimeter: The total length of the line set is dynamically displayed as you draw. If you use a shortcut menu to complete drawing with an open shape, the total line set length is shown. If you double-click to form a polygon, its perimeter is shown.
Cursor Location:
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X: The X coordinate of the cursor position relative to the top left page corner.
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Y: The Y coordinate of the cursor position relative to the top left page corner.
Settings tab
See Distance Tool floating window for details.
Markup tab
Use the Markup tab settings to preserve measurement values in comments.
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Use Markup: Store the current and future measurements with your PDF document; otherwise, all results are discarded as soon as you start a new measurement. In the text field, type the text to display in a pop-up comment window when you hover the cursor over any line in the shape.
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Measuring Color: Set the color for measuring lines.