6.3 Permutation groups and cyclic groups Exampl ole: Consider the equilateral triangle with vertices 1, 2, and3. Let l1, L2, and l3 be the angle bisectors of the corresponding angles, and let o be their point of intersection Counterclockwise rotation of the triangle about o through120°,240°,360°(06.3 Permutation groups and cyclic groups Example: Consider the equilateral triangle with vertices 1，2，and 3. Let l1 , l2 , and l3 be the angle bisectors of the corresponding angles, and let O be their point of intersection。 Counterclockwise rotation of the triangle about O through 120°,240°,360° (0°)