## Wednesday, October 12, 2011

### Geometry - What is Rotational Symmetry?

Rotational Symmetry is when a figure is rotated less than a full turn around its center point so that it would fit perfectly on the original shape.

Many natural and man-made objects are symmetrical in 2 and 3 dimensions.

Snowflakes and the petals of some flowers have rotational symmetry.

Suggested Activities for Students

• Have students explore their homes and classrooms to look for examples of rotational symmetry.

• Have students explore their outdoor environment to look for examples of rotational symmetry. Take a camera!

• Have students look in magazines, catalogs, books, etc. for pictures of rotational symmetry.

• Have students identify, sketch, and/or label shapes that have rotational symmetry. All regular polygons (and regular polyhedra) have rotational symmetry.

 Circle

• Have students use GEOBOARDS to create rotational symmetry designs.

• Have students use GEOMETRIC SHAPES or other MANIPULATIVES to create rotational symmetry designs.

 Attribute Blocks

 Pattern Blocks

• Have students use Art Materials to create rotational symmetry designs.
~ Art Supplies - crayons, colored pencils, paint, etc.
~ Stickers
~ Dot Paper
~ Grid Paper
~ Popsicle Sticks
~ Pretzel Sticks
~ Etc.

~ Rotational Symmetry - 3rd grade lesson

~ Identify and Describe Rotational Symmetry

~ Order of Rotational Symmetry

Have fun with Symmetry!

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