如图,在梯形ABCD中,AD//BC,∠B=90°,以AB为直径作⊙O,恰与另一腰CD相切于点E,连结OD、OC、BE.
![](https://img.xkw.com/dksih/QBM/2022/2/22/2921785163202560/2926269569654784/STEM/25245d44-e740-4086-b3ad-23d08838a4ca.png?resizew=133)
(1)求证:OD//BE;
(2)若梯形ABCD的面积是48,设OD=x,OC=y,且x+y=14,求CD的长.
![](https://img.xkw.com/dksih/QBM/2022/2/22/2921785163202560/2926269569654784/STEM/25245d44-e740-4086-b3ad-23d08838a4ca.png?resizew=133)
(1)求证:OD//BE;
(2)若梯形ABCD的面积是48,设OD=x,OC=y,且x+y=14,求CD的长.
更新时间:2022-02-28 18:53:35
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相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】如图,
相交于点O,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/27/81a1c8ea-6a09-49d2-87d6-01b80613b3d8.png?resizew=184)
(1)求证:
;
(2)若
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83fe060a37a93ea736e9c3d444809cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d2530e7023b2345c651e8f53629ff1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/276f64bcfa74b44c5ef5ca88fc8208f3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/27/81a1c8ea-6a09-49d2-87d6-01b80613b3d8.png?resizew=184)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7de966c316db1013defc56372fcf814e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52a7682e85567dfdf6daef514d96ae2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d17e587b7fcc3f7ef52c0a542141daa2.png)
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解答题-证明题
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适中
(0.65)
【推荐2】如图,在五边形ABCDE中,∠B=∠E=90°,BC=DE,连接AC,AD,∠ACD=∠ADC.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/21/109dde4f-0492-4054-9e01-3e671ea94e9e.png?resizew=227)
(1)求证:
.
(2)若
,∠ACD=65°,求∠BAE的度数.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/21/109dde4f-0492-4054-9e01-3e671ea94e9e.png?resizew=227)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6cf0a8b91540e242ad7985683e0eafa.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43defd54316aac92a3d18d4d400033c2.png)
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名校
【推荐1】如图,在菱形
中,对角线
,
交于点O,过点A作
的垂线,垂足为点E,延长
到点F,使
,连接
.
是矩形;
(2)连接
,若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/946c16d99496d31ce4d87301a4793393.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
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解答题-证明题
|
适中
(0.65)
【推荐2】在
中,
,
,将线段
绕点
逆时针旋转
得到线段
,连接
.将线段
绕点
顺时针旋转
得到线段
,连接
.
;
(2)延长
到点
,使得
,连接
交
于点
,依题意补全图2 .若点
是
的中点,用等式表示线段
,
,
之间的数量关系,并证明.
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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(2)延长
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真题
【推荐1】如图1,AB是⊙O的直径,点C在AB的延长线上,AB=4,BC=2,P是⊙O上半部分的一个动点,连接OP,CP.
(1)求△OPC的最大面积;
(2)求∠OCP的最大度数;
(3)如图2,延长PO交⊙O于点D,连接DB,当CP=DB时,求证:CP是⊙O的切线.
(1)求△OPC的最大面积;
(2)求∠OCP的最大度数;
(3)如图2,延长PO交⊙O于点D,连接DB,当CP=DB时,求证:CP是⊙O的切线.
![](https://img.xkw.com/dksih/QBM/2014/7/30/1573742155628544/1573742161690624/STEM/ada9861116fb49fc965598b5b38d6f4b.png?resizew=420)
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解答题-作图题
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适中
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【推荐2】如图,
是
的直径,射线
交
于点C.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/0eb88f2c-e7ea-46ee-aa86-2de6cb51074f.png?resizew=162)
(1)尺规作图:求作
的中点D.(保留作图痕迹)
(2)过点D画
垂足为E.求证:
是
的切线.
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/0eb88f2c-e7ea-46ee-aa86-2de6cb51074f.png?resizew=162)
(1)尺规作图:求作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed41d321f4c0717ac5b443aad942d9a7.png)
(2)过点D画
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68fbbd17c89f03dbb61cd6ffdb9a0344.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
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解答题-证明题
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适中
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【推荐1】如图,
是
的直径,
是半圆上的一点,
与
所在的直线互相垂直,
于点
,交
于点
.
![](https://img.xkw.com/dksih/QBM/2022/12/5/3124212974313472/3170373045051392/STEM/749d4fb255f14679a4828ab3c72c7544.png?resizew=136)
(1)求证:
平分
;
(2)若点
为弧
的中点,
的半径为
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/2022/12/5/3124212974313472/3170373045051392/STEM/749d4fb255f14679a4828ab3c72c7544.png?resizew=136)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4189a0821a0ffab9dc171ecd279ba442.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
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解答题-证明题
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适中
(0.65)
【推荐2】如图,
是
的直径,
是
的两条弦,
,过点D作
的切线交
的延长线于点E.
;
(2)若
,
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(2)若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
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