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题库 / Prep2007E1-DS-69
In triangle ABC above, what is the length of side BC ?
(1) Line segment AD has length 6.
(2) x = 36
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.
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（1）∠BDC=∠BAD + ∠ABD 2x=x+∠ABD，DAB和BDC均为等腰三角形。
（2）X=36 不能 只有度数，没有长度，无法推，不充分
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