As shown in the figure, the diameter AB of circle O is perpendicular to the chord CD, the foot of perpendicular is the point E, angle CAO = 22.5, OC = 6.0, then the length of CD is ()
Choices:
A:6√{2}
B:3√{2}
C:6
D:12
Please directly answer the question and provide the correct option letter, e.g., A, B, C, D.
Question: As shown in the figure, the diameter AB of circle O is perpendicular to the chord CD, the foot of perpendicular is the point E, angle CAO = 22.5, OC = 6.0, then the length of CD is ()
Choices:
A:6√{2}
B:3√{2}
C:6
D:12
Please first conduct reasoning, and then answer the question and provide the correct option letter, e.g., A, B, C, D, at the end.
Question: As shown in the figure, the diameter AB of circle O is perpendicular to the chord CD, the foot of perpendicular is the point E, angle CAO = 22.5, OC = 6.0, then the length of CD is ()
Choices:
A:6√{2}
B:3√{2}
C:6
D:12