Symmetry

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Symmetry
A PowerPoint Presentation by Michelle
Allison Stacey Brown Amy Rader
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Symmetry

• The term symmetry comes from the Greek words
  sun(with or together) and metron(measure).
• From the beginning symmetry was related to
  harmony, beauty, and unity.
• Much is discovered by observing the patterns
  surrounding us in nature.

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Symmetry

• Mathematics is more than finding sums and
  differences. Mathematics is a way of looking at
  the world. You view the world looking for
  patterns or lack of patterns.
• We are surrounded by all types of symmetry in
  nature, in architecture, in art and much more.

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Standards

• 2.9 E Identify and draw lines of symmetry in
  geometric figures.
• 2.9 F Identify symmetry in nature

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Lines of Symmetry

• Line Symmetry a figure that can be folded in
  such a way that one half of it lies exactly on
  the other half.

• Rotational Symmetry a figure is said to have
  rotational symmetry if there exists a point
  around which the figure can be rotated less than
  one complete turn of 360 degrees in order to
  result in an identical figure.

• Point Symmetry a figure is said to have point
  symmetry if it can be rotated one-half of a turn
  or 180 degrees about a point onto itself.

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A makes two matching parts.
line of symmetry
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Can some shapes have more than one line of
symmetry?
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Can you find symmetry in nature?