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In quadrilateral ABCD, is angle BCD a right angle?
(1) Angle ABC is a right angle
(2) Angle ADC is a right angle
分析A选项
分析B选项
分析C选项
分析D选项
分析E选项
我有更好的解析 
暂无雷哥网文字解析
结合起来也不充分 只知道BCD和另一个角相加为180度，无法判断是否为90度
贾思敏
quadrilateral：四边形，不是平行四边形
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2021-11-02 15:27:39
小麻花儿
这道题是根据图去思考，还是给出图形是个bug？做题的时候不能看图形？ 如果图是题的一部分的话，通过第一张图能看出来边是平行的，所以邻角90度能证明它也是直角。第二张图明显看出对边不平行，所以如果邻角90度，它一定不是90度。那么两个条件单独都是充分的
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2021-07-15 09:56:25
如果有时间的话我也能做对回复小麻花儿
og说了不能看图的。我做错完全是因为不认识字。把quadrilateral 这个词认成平行四边形了。其实他意思只是四边形
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2021-08-01 23:36:41
小黑皮
这题直接把图给画好了？
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2021-02-03 02:04:55
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数据充分DS
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