Mathematics for IGCSE & O level - Symmetry (Section 1 - No. 38)
How is rotational symmetry order determined?
By counting lines of symmetry.
By the shape's number of sides.
By how many times the shape matches its original appearance during a full turn.
By the shape's angles.
解释
The rotational symmetry order is determined by how many times the shape matches its original appearance during a full turn.