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.
答案是C，但我觉得是E啊作者: taohuaxian 时间: 2010-11-19 06:50
90 90 60 120
90 90 45 135
都可能出现邻角二倍关系
应该是E作者: youngerlee 时间: 2010-11-19 20:34
thanks @
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