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.
我觉得是D,答案是C
请指教
选E
是这样的,有两个角一个角是另一个角的两倍,人家可没说这个角不是直角啊。
所以四个角是90、90、45、135也是有可能的。
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