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2.10 Can I use different settings for the new documents created by Inkscape?. 2.9 How can I print the tutorials? When printed from Inkscape they don't fit, and I don't like reading on screen. 2.8 Does Inkscape support palettes? Where can I "store" and save colours for further use?. 2.7 How do I measure distances and angles?. 2.6 How can sine curves be made in Inkscape?. 2.5 How do I insert math symbols or other special symbols in the drawing?. 2.4 How do I change the color of markers ( e.g., arrow ends)?. 2.2 How do I scale or rotate groups of nodes?. 1.11 To update to a new version of Inkscape in Windows, do I need to uninstall the old version?.
1.10 Will there be an Inkscape 1.00? What would it be like?. 1.8.1 How do I make a SVG object that link to an Internet site when I click on it ?.
1.5 On what platforms does Inkscape run?. 1.4 Is Inkscape ready for regular users to use?. 1.3 What is "Scalable Vector Graphics"?. You'll see a red outline of the new path. You can see that it worked by using the Node tool F2 and hovering over the line. (If there were multiple markers, you'll need to do this one-at-a-time for each marker). With both the line and stroke selected, click Path > Union. This will convert the stroke into multiple paths-one for the line itself and one for each marker.
Change the stroke width to increase/decrease the size of the arrow. Choose an arrow for the Start Marker and/or End Marker. Open Fill and Stroke dialog ( Shift+ Ctrl+ F). It also allows you to do things like set a different stroke and fill color for the line (so that it can stand out when it doesn't contrast well with the background).
Converting the line to a path helps ensure image fidelity. In my experience, lines with markers can be rendered incorrectly by some SVG applications. You may want it to be a path instead, which I think is what Tomáš Zato was getting at with his comment. When you first create an arrow, it will be a stroke.