Symmetry

Symmetry

• Lines of Symmetry

• Rotational Symmetry

• a line that divides a figure into 2 identical (congruent) parts

• must pass through the center ​

• ​think of as "folding"

• can have multiple lines of sym.

• lines can be vertical, horizontal, diagonal​

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Lines of Symmetry

Multiple Choice

Symmetrical?

• Is symmetrical

• not symmetrical

Multiple Choice

Symmetrical?

• Is symmetrical

• not symmetrical

Multiple Choice

How many lines of symmetry does this trapezoid have?

• 0
• 1
• 2
• 3

Multiple Choice

How many lines of symmetry does this shape have?

• 0
• 1
• 2
• 4

• when a shape looks the same after rotating

• rotate up to 180

• if at any point it looks identical as it did before rotating

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Rotational Symmetry

Multiple Choice

Which shape does NOT have rotational symmetry?

• A
• B
• C
• D

• # of times a shape can be rotated & still look like it did before rotation

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• includes full rotation - 360

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Order of Rotational Symmetry

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Multiple Choice

Which letter does not have rotational symmetry?

• I

• O

• T

• S