如图,在正方形ABCD中,点G是对角线上一点,CG的延长线交AB于点E,交DA的延长线于点F,连接AG.
![](https://img.xkw.com/dksih/QBM/2022/4/2/2949379203334144/2949590072254464/STEM/000b9e38-7565-4f22-ad5c-b93abbcf5023.png?resizew=318)
(1)求证:AG=CG;
(2)若GE•GF=9,求CG的长.
![](https://img.xkw.com/dksih/QBM/2022/4/2/2949379203334144/2949590072254464/STEM/000b9e38-7565-4f22-ad5c-b93abbcf5023.png?resizew=318)
(1)求证:AG=CG;
(2)若GE•GF=9,求CG的长.
更新时间:2022-04-02 17:39:16
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【推荐1】如图,∠BAC=∠DAE=90°,AB=AC,AD=AE,BE、CD交于F.
(1)求证:BE=CD;
(2)连接CE,若BE=CE,求证:从“①DE⊥AC”、“②DE∥AB”中选择一个填入(2)中,并完成证明
(1)求证:BE=CD;
(2)连接CE,若BE=CE,求证:从“①DE⊥AC”、“②DE∥AB”中选择一个填入(2)中,并完成证明
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【推荐2】如图①,在
中,
,
,点D,E分别在边
上,
,连接
.将
绕点A顺时针方向旋转,旋转角为
(
).
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/15/941a51c4-0bbe-4b4d-bfa6-5588d3e04ef7.png?resizew=462)
(1)如图②,当
时,连接
,填空:
与
的数量关系为: ;
与
的位置关系为: ;
(2)当
时,
与
交于点F,(1)中的结论还成立吗?若成立,请结合图③写出证明过程;若不成立,请说明理由;
(3)当
旋转到
时,请直接写出
的长.
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(1)如图②,当
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【推荐1】如图,在正方形ABCD中,E,F分别是AD,CD的中点,连接BE,AF交于点M,分别延长AF,BC交于点N.
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(1)求∠BMN的度数;
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【推荐2】如图,已知
是正方形
内一点,
,
,
将
绕点
旋转至
,连结
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/29/5f87f6e7-b06b-4627-ba02-df9483b080d5.png?resizew=187)
(1)直接写出
、
的长度和
的度数.
(2)求
的长.
(3)试判断
的形状并说明理由.
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【推荐1】如图,直角梯形OABC中,OC∥AB,C(0,3),B(4,1),以BC为直径的圆交x轴于D、E两点(点D在点E的右方)求点E、D的坐标.
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【推荐2】已知:如图,在半圆O中,直径AB的长为6,点C是半圆上一点,过圆心O作AB的垂线交线段AC的延长线于点D,交弦BC于点E.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/5/c1d12b2b-0528-4e4e-becc-e1f05e06c7ad.jpg?resizew=133)
(1)求证:∠D=∠ABC;
(2)记OE=x,OD=y,求y关于x的函数表达式;
(3)若OE=CE,求图中阴影部分的面积.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/5/c1d12b2b-0528-4e4e-becc-e1f05e06c7ad.jpg?resizew=133)
(1)求证:∠D=∠ABC;
(2)记OE=x,OD=y,求y关于x的函数表达式;
(3)若OE=CE,求图中阴影部分的面积.
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