The end of a right-angled polyhedron is square. How many times are the following axes of symmetry the object's axes of rotation?

a) [[$ a $]]

Answer: The symmetry axis [[$ a $]] is the axis of rotation times .

b) [[$ b $]]

Answer: The symmetry axis [[$ b $]] is the axis of rotation times.

c) [[$ c $]]?

Answer: The symmetry axis [[$ c $]] is the axis of rotation times.