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标题: gwd30-9 [打印本页]

作者: xionghuixhs 时间: 2007-1-25 06:58 标题: gwd30-9

Is the measure of one of the interior angles of quadrilateral ABCD equal to 60 degrees?

(1) Two of the interior angles of ABCD are right angles.

(2) The degree measure of angle ABC is twice the degree measure of angle BCD.

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.

B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.

C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

D. EACH statement ALONE is sufficient.

E. Statements (1) and (2) TOGETHER are NOT sufficient.

Why not E?

90-90-120-60

90-90-45-135

作者: liushuixian 时间: 2007-1-25 20:22

（1）＋（2）

四个角为45，90，90，135

作者: hjgjfgfb 时间: 2007-1-26 20:22

ding !!!!!!!!!!!!

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