Mathematics for IGCSE & O level - Symmetry (Section 1 - No. 31)
What does the order of rotational symmetry represent?
The number of lines of symmetry.
The degrees of rotation.
The number of times a shape fits itself in a full turn.
The number of sides of the shape.
解释
The order of rotational symmetry is the number of times a shape fits onto itself during a full turn.