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symmetrical about a line


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A plane figure is symmetrical about the line l if, whenever P is a point of the figure, so too is P′, where P′ is the mirror-image of P in the line l. The line l is called a line of symmetry; and the figure is said to have bilateral symmetry or to be symmetrical by reflection in the line l. The letter A, for example, is symmetrical about the vertical line down the middle.

Subjects: Mathematics.


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