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If an object maps onto itself after being rotated 180 degrees or less about a line, it has

If an object maps onto itself after being rotated 180 degrees or less about a line-example-1

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4 votes

Answer:

rotational symmetry

Explanation:

If an object maps onto itself after being rotated 180 degrees or less about a line, it has rotational symmetry.

User Masato Nakazawa
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2 votes

Answer:

rotational symmetry

Explanation:

That's the definition of rotational symmetry: the object maps to itself after rotation of less than one full turn.

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The number of different rotational angles at which the object maps to itself defines the order of the rotational symmetry.

User Barnee
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