Mathematics for IGCSE & O level - Symmetry (Section 1 - No. 42)
If a shape has rotational symmetry of order 6, at what angle increments does it fit onto itself?
30 degrees
60 degrees
90 degrees
120 degrees
คำอธิบาย
A shape with rotational symmetry of order 6 fits onto itself every 360/6 = 60 degrees.