help2day
Identify a quadrilateral with 180* but not 90* rotational symmetry
What is a quadrulateral that with a 180 degree rotational symmetry?
What is a quadrulateral that with a 180 degree rotational symmetry?
Rotational symmetry
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DoctorT
Replied to: Identify a quadrilateral with 180* but not 90* rotational symmetry...
A rectangle. You have to turn it through 180 degrees before it is indistinguishable from the original position. See ISBN 9780974168906.