Any polygon with 2n sides where the sides j and j+n are equal as are the corresponding angles.
For example, a hexagon (n = 3) with side 1 = side 4, side 2 = side 5 and side 3 = side 6 and similarly with angles, will have rotational symmetry of order 2.
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As the name suggests, they are polygons that have one or more lines of symmetry or rotational symmetry of order two or more. A symmetric polygon is not the same as a regular polygon.
A general parallelogram has rotational symmetry of order two.
Yes. An ellipse (oval) has two lines of symmetry, but not a rotational symmetry. A parabola has one line and no rotation.
Yes. A circle has infinitely many lines of symmetry and it also has rotational symmetry of infinite order.
two-fold
Two.
line
Two.
A "pure" trapezoid (a pair of parallel sides and two random sides) does not have rotational symmetry. If it is a parallelogram then it has a 180 degree symmetry. And if the paralloelogram happens to be a square, you have 90 deg symmetry.
It has rotational symmetry of order 2.
It have 4 axis of symmetry . Two Perpendiculars and two Diagonals
order two