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MATHEMATICS OBJECTIVE
Students will be able to:
Understand reflections as a type of transformation and how they differ from translations.
Use coordinates to describe the image created by a reflection.
Reflect a two-dimensional figure on a coordinate plane.
ESSENTIAL UNDERSTANDING
Reflections create images that have the same size and shape but different orientation. The image and preimage are the same distance from the line of reflection.
I can understand what a reflection is.
I can describe reflections done on coordinate plane.
I can reflect a 2-D figure on the coordinate plane.
REFLECTIONS
A reflection, or flip, is a transformation that flips a figure across
a line of reflection. The preimage and image are the same distance from
the line of reflection but on opposite sides. They have the same size
and shape but different orientations.
DIAGRAM DESCRIPTION
A quadrilateral ABCD, the preimage, appears to the left of a vertical
line of reflection labeled m. Its reflected image A'B'C'D' appears on
the right. Corresponding points C and C' are joined by a dashed horizontal
segment that crosses the line of reflection at a right angle. The figures
are mirror images with equal size and shape but reversed orientation.
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