transformation
http://mrsdell.org/geometry/motion.html
A movement that doesn't change the size or shape of a figure is a rigid transformation.
Examples
:
translation (slide)
A movement of a geometric figure to a new position without turning or flipping it
Example
:
reflection (flip)
The figure formed by flipping a geometric figure over a line of reflection to obtain a mirror image
Example
:
rotation (turn)
A turning of a figure about a fixed
point
Example
: