Question

how is the threefold axis of symmetry represented?
a. 90 degrees
b. 45 degrees
c. 60 degrees
d. 120 degrees

Explanation:

A three - fold axis of symmetry means that a rotation of the object by an angle to return to its original appearance occurs three times in a full 360 - degree rotation. So, the angle of rotation is calculated by dividing 360 degrees by 3, which gives 120 degrees.

Answer:

D. 120 degrees