Symmetry Flashcards
What is Symmetry?
A figure has symmetry if there is a transformation of the figure such that the image coincides with the preimage.
What is Line Symmetry?
A figure has line symmetry (or reflection symmetry) if it can be reflected across a line so that the image coincides with the preimage. The line of symmetry (also called the axis of symmetry) divides the figure into two congruent halves.
What is Rotational Symmetry?
A figure has rotational symmetry (or radial symmetry) if it can be rotated about a point by an angle greater than 0 degrees and less than 360 degrees so that the image coincides with the preimage.
What is Plane Symmetry?
A three-dimensional figure has plane symmetry if a plane can divide the figure into two congruent reflected halves.
What is Symmetry About An Axis?
A three-dimensional figure has symmetry about an axis if there is a line about which the figure can be rotated (by an angle greater than 0 degrees and less than 360 degrees) so that the image coincides with the preimage.
