symmetrical about a point

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A plane figure is symmetrical about the point O if, whenever P is a point of the figure, so too is P′, where O is the midpoint of PP. The point O is called a centre of symmetry; and the figure is said to have half-turn symmetry about O because the figure appears the same when rotated through half a revolution about O. The letter S, for example, is symmetrical about the point at its centre.

Subjects: Mathematics.

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