Chapter 9 Preview
Transformation: maps (moves) an initial figure (preimage) onto a final figure (image)
There are 4 types of transformations:
Translation: sliding a preimage in any direction (without turning it)
Reflection: flipping a preimage over a defined line of reflection.
Rotation: turning a preimage around a defined point (the point of rotation) a certain number of degrees.
Dilation: reducing or enlarging a preimage
Line of Symmetry: a line or fold location for a figure that produces halves that match exactly (are congruent)
Translation: a transformation that moves (slides) all points of a figure the same distance in the same direction
Composition: a transformation made up of successive transformations
Glide Reflection: a composition of a translation and a reflection in a line parallel to the direction of the translation
Rotation: a transformation that turns every point of a preimage through a specified angle and direction around a fixed point
Section 9.4 Tessellations