In triangle ABC above, the bisector of angle BAC is perpendicular to BC at point D. The length of AB is equal to the length of AC. If AB = 6 and BD = 3, what is the measure of angle BAC?
Choices:
A.15*\degree
B.30*\degree
C.45*\degree
D.60*\degree
E.75*\degree
Please directly answer the question and provide the correct option letter, e.g., A, B, C, D.
Question: In triangle ABC above, the bisector of angle BAC is perpendicular to BC at point D. The length of AB is equal to the length of AC. If AB = 6 and BD = 3, what is the measure of angle BAC?
Choices:
A.15*\degree
B.30*\degree
C.45*\degree
D.60*\degree
E.75*\degree
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: In triangle ABC above, the bisector of angle BAC is perpendicular to BC at point D. The length of AB is equal to the length of AC. If AB = 6 and BD = 3, what is the measure of angle BAC?
Choices:
A.15*\degree
B.30*\degree
C.45*\degree
D.60*\degree
E.75*\degree