摘要：20．如图.在中.为上两点.且.． 求证:(1), (2)四边形是矩形． [命题意图]考查学生的逻辑推理能力 [试题来源]课本练习题的改编 [参考答案]解:(1). .. ．··························· 1分 四边形是平行四边形. ．··························· 2分 在和中. ... ．························ 3分 (2)解:. ．··························· 4分 四边形是平行四边形. ． ． ．························· 5分 四边形是矩形．······················ 6分

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