Objective
To find reflection images of figures
Reflections
In the Solve It, you visualized shapes flipping across lines. Notice that when a figure flips across a line, the preimage and its image are congruent and have opposite orientations. You can tell that two figures have opposite orientations if the corresponding vertices of the preimage and image read in opposite directions.
Essential Understanding The size and shape of a geometric figure stay the same when you flip the figure across a line. Its orientation reverses.
Reflection across a line r, called the line of reflection, is a transformation with these two properties:
A reflection across a line is an isometry.