: How to fill in areas surrounded by line segments? I have a rectangular shape and I added an "extension area" to it with several line segments and closed it back to the rectangle. Specifically,

@Caterina889

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Grab the Live Paint Bucket Tool (it's underneath the Shape Builder Tool)
Click once to make a Live Paint Group from the lines and shape
Pick a color, and click the area you wish to fill.
Click the Expand button on the Control Bar across the top of the screen to expand the Live Paint Group back to standard shape and paths.

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@Si6392903

What you probably have is two different shapes or 4 different lines and your rectangle.

Look in the layer window to see what you have cooking
(Window>Layers)

if its 4 different lines, select them all, without the rectangle, and press CTRL or CMD +J, this will join them together. Then Fill.

If its 2 shapes your new polygon and the rectangle, just select the new polygon from layers and fill.

The "?" is cause by multiple objects being selected with different appearances.
It cant show more than one so it shows "?".

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