It has rotational symmetry.
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Any shape with a rotational symmetry of order 2 or more.
It is an angle that has a turn of less than 360 degrees which is a full turn.
Rotational Symmetry.
Yes. A rotation by any integer multiple of 45° will produce a figure that will superimpose on the original, un-rotated octagon. 45° 90° 135° 180° 225° 270° 315° as well as a full rotation of 360°.
yes * * * * * No! A rectangle rotates into itself at kπ radians where k is an integer - ie half a turn and its multiples.