Go to the Illustrator toolbox and select the line segment tool and draw the line (you can use the other tools to draw lines as well) and then if you wish to use the line as 'proper shape' or closed path in Illustrator then you can expand the line using the Object menu expand command. Best bet, add a decent stroke width or perhaps use width profiles with the line to get more interesting shape. You can also use width tool to drag out the 'width' of the stroke - this can also then be converted into a closed path (shape). If you mean shape as a 'Illustrator symbol' - simply drag the line over to the symbols palette to save it as Illustrator shape for future use.
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If divided by a vertex-to-vertex line, it is an isosceles trapezium. If divided by a line from one side to the opposite side, it will make an irregular pentagon.
You cannot have a shape without any line segments.
A dotted line can be a line of symmetry if it divides a shape into two equal parts that are mirror images of each other. In geometry, a line of symmetry is a line that divides a shape into two congruent parts. Whether a dotted line is a line of symmetry depends on the specific shape and the placement of the line.
A shape where when you take any two points in the shape the line connecting them will be totally in the shape.
out line