symmetrical about a line

Show Summary Details

Quick Reference

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.

Reference entries

Users without a subscription are not able to see the full content. Please, subscribe or login to access all content.