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In
each of the following three folding activities, the objective is to
reinforce the concept of line reflections. An important element of
the exercises is to emphasize that the distance from a point to the line
of reflection is equal to the distance from the point's image to the line
of reflection. Encourage students to measure to verify this concept.
1.
Dark Imprint Folding
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Fold a sheet of paper.
Draw a polygon using a dark colored marker. Turn the
paper over and trace the image of the polygon as seen
through the paper. Open the paper to reveal
both the object and its reflection. Use a ruler to
measure the distances from the vertices of the polygon
(and its image) to the line of reflection.
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2.
Food Coloring Folding
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Fold a sheet of paper (or graph paper). Open the paper
and place several drops of food coloring on one side of the
fold. Fold the paper allowing the food coloring to
smear onto the other side of the page. Find
distinguishing features on several of the "blobs".
Have students measure distances to the line of reflection
from these features and their images.
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3.
Image Imprint Folding
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Choose an object which has distinct edges,
such as a key. Place the object between a folded sheet
of paper. Massage the image through the paper being
particularly careful to outline the edges. Open the
paper and view the imprint of the object. Have
students measure from a position on the object (and on its
image) to the line of reflection.
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