A regular decagon, which has 10 equal sides and angles, has 10 rotational symmetries. These symmetries correspond to the decagon being rotated by multiples of (36^\circ) (360° divided by 10), including the identity rotation (0°). Therefore, the decagon can be rotated to match its original position in 10 different orientations.
An ellipse has rotational symmetry of order 2.
yes, in fact it can have 6 rotational symmetries.
A seven-pointed star has seven rotational symmetries. This means it can be rotated in increments of ( \frac{360^\circ}{7} ) and still appear unchanged. Each of these rotations corresponds to one of the seven points of the star. Therefore, the total number of rotational symmetries is equal to the number of points.
10
None, however the semicircle has one folding axis of symmetry perpendicular to the midpoint of the straight side
A decagon can have rotational symmetries of order 1, 2, 5 or 10.
It has 8 rotational symmetry.
Infinitely many.
An ellipse has rotational symmetry of order 2.
2
yes, in fact it can have 6 rotational symmetries.
5
9 reflection
18
Two.
a heart have no rotational symmetry!
A regular hexagon has 6 rotational symmetries (rotational symmetry of order six) and 6 reflective symmetries (six lines of symmetry).