Rotational Symmetry

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Rotational Symmetry
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Rotational Symmetry

• An image has Rotational Symmetry if there is a
  center point around which the object is turned a
  certain number of degrees and the object still
  looks the same, for example, it matches itself a
  number of times while it is being rotated.

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Rotational Symmetry

• Since this triangle will match itself 3 times as
  it is rotated it is said to have rotational
  symmetry of Order 3.

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Rotational Symmetry

• This flower has rotational symmetry of Order 5
  since it matches itself 5 times.

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Rotational Symmetry

• Since all the toppings are placed so evenly, this
  pizzahas rotational symmetry of Order 6.

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Rotational Symmetry

• Often the picture cards in a playing deck have
  rotational symmetry.

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Rotational Symmetry

• Many shapes have rotational symmetry.

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Rotational Symmetry

• You can even see rotational symmetry in everyday
  things.

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Review

• What are the different orders of each wheel?

Order 9
Order 7
Order 12
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Summary

• An image has Rotational Symmetry if there is a
  center point around which the object is turned a
  certain number of degrees and the object still
  looks the same.

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Assignment

• Pg. 271 1-7, 9-11,32-38
• EALR Hint Component 1.3 Understand and apply
  concepts and procedures from geometric sense.
• Shortly before class ends, we will review problem
  number nine from your assignment. Have it ready
  to look over.