如图，折叠长方形纸片ABCD，先折出折痕（对角线）BD，再折叠使AD边与BD重合，得折痕DG，若AB=4，BC=3，求AG的长．_刷题宝

题干

如图，折叠长方形纸片ABCD，先折出折痕（对角线）BD，再折叠使AD边与BD重合，得折痕DG，若AB=4，BC=3，求AG的长．

上一题下一题 0.0难度选择题更新时间:2012-02-16 06:52:45

答案(点此获取答案解析）

解：过点G作GE⊥BD于E，

根据题意可得：∠GDA=∠GDB，AD=ED，∵四边形ABCD是矩形，∴∠A=90°

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