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Unit 4: Geometry and Symmetry

Chapter 1 & 4

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1.1 – Line Symmetry

Line Symmetry: __________________________________________________________________________________________________________________________________

Also known as:

A figure may have ______, ________, or ___________ lines of symmetry.

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A line of symmetry may be:

•  

•  

•  

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How to Find Lines of Symmetry

• Mira - This geometric tool has the reflective quality of a mirror, as well as a transparent quality to provide a new look at geometry. By placing the MIRA™ on any shape, students quickly see concepts of symmetry and congruence.

•

•  

•  

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Example 1 – Find the line symmetry in each part.

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Example 2 – Complete Drawings Using Symmetry

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Method 1 – Paper folding•  

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Method 2 – Counting

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1. Graph ∆ABC A (4, 1) B (2, 4) C (2, 1)

2. Translate ∆ABC 3 units to the right.

A‛ ( , )

B‛ ( , )

C‛ ( , )

3. Reflect ∆ABC about the y-axis.

A‛ ( , )

B‛ ( , )

C‛ ( , )

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Page 12

#1-10, 12 & 13, 15-17

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1.1 Line SymmetryFriday, November 9th