An equilateral triangle has a point O as its center. What is the angle of rotational symmetry about the point O, and what is the number of lines of symmetry for this figure?

Which of the following English capital letters has exactly one line of symmetry?

Which of the following capital letters of the English alphabet does not have rotational symmetry (for an angle of rotation less than 360°)?

Which of the following figures has linear symmetry but no rotational symmetry?