A reflection is a transformation in which an image is formed by reflecting the preimage over a line called the line of reflection. All corresponding points in the image and preimage are equidistant from the line of reflection.
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Similar standards in other grades
Identify polygons with 10 or fewer sides in multiple orientations (rotations, reflections, and translations of the polygons).
Identify polygons by name with 10 or fewer sides in multiple orientations (rotations, reflections, and translations of the polygons).
While investigating symmetry, children move figures, such as pattern blocks, intuitively, thereby exploring transformations of those figures. A transformation is the movement of a figure — either a translation, rotation, or reflection. A translation is the result of sliding a figure in any direction; rotation is the result of turning a figure around a point or a vertex; and reflection is the result of flipping a figure over a line. Children at this level do not need to know the terms related to transformations of figures.
investigate congruence of plane figures after geometric transformations, such as reflection, translation, and rotation, using mirrors, paper folding, and tracing; and
recognize the images of figures resulting from geometric transformations, such as translation, reflection, and rotation.