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题库 / Prep2007E2-DS-178
In the figure shown, point O is the center of the semicircle and points B, C, and D lie on the semicircle. If the length of line segment AB is equal to the length of line segment OC, what is the degree measure of angle BAO ?
(1) The degree measure of angle COD is 60.
(2) The degree measure of angle BCO is 40.
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
EACH statement ALONE is sufficient.
Statements (1) and (2) TOGETHER are NOT sufficient.
还没有题目讲解（毕出老师会陆续发布对官方考题的解读，请保持关注）。
我想到一个思路，能不能反推。就是我假设我知道角CAO，然后我去看看能不能把角COD算出来。这样应该解题会简单点！
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