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Mathematical l-shape
As shown in the figure:

Problem analysis: the definition of axisymmetric figure: that is, on a plane, if a figure is folded in half along a straight line, the parts on both sides of the straight line can completely overlap. Such a graph is called an axisymmetric graph.

Solution: As shown in the figure:

Comments: Basic drawing is the focus of junior high school mathematics, which runs through the whole junior high school mathematics study. It is a common knowledge point in the senior high school entrance examination, which is generally not difficult and needs to be mastered skillfully.