如图,
是
的直径,
是
的一条弦,且
于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/11/d23142cb-d901-4883-94b8-32890d6e3558.jpg?resizew=123)
(1)求证:
;
(2)若
,
,求
的半径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/11/d23142cb-d901-4883-94b8-32890d6e3558.jpg?resizew=123)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01ac5998620b6821d6e58b62901806c3.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59285b7c667118b249b50cecc152a670.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdebe7f5b900204915a325279a2ab706.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
更新时间:2022-11-09 08:40:14
|
相似题推荐
解答题-问答题
|
较易
(0.85)
【推荐1】请将下面的说理过程和理由补充完整.
已知:如图,在等腰
中,
,点D,E分别在
,
上,
.试说明:
.
解:
是等腰三角形,
,
( ① ).
,
(等式的性质).
即
② .
在
和
中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/115f30804cc35ce1d8a9232736dc5e09.png)
( ④ ).
( ⑤ ).
已知:如图,在等腰
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c775040c86751ed13ec55ecd977ee33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d212c1709b8e72a055cf1b5381ef64.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/16/1dc688af-aee9-4f80-81a3-007160ce69e9.png?resizew=129)
解:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce8f76f6531524d4f34e30899dc492b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f162eb627de59b28702b5593e82b530f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fc26fb012119197a3f14e34f0e0f660.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa1a95d113c2740aaa36dd660f39d7da.png)
即
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6217ba54baf35aca59d9b89ded7367e.png)
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/115f30804cc35ce1d8a9232736dc5e09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/385ab59d552a9d977879a7cfcbd4724f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be233d077c07796e3c68a813b9456dd2.png)
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【推荐2】在
中,
,
,
、
两点在直线
上(点
在点
的左侧).若
,
,求证:
是等边三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/421291381be28da4bd16560fd383b4a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b3df3384f0f55b67ee9cf42f75e34b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/17/4b9feeff-9677-4491-8820-70a5f55e4cb0.png?resizew=233)
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解答题-证明题
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【推荐1】如图,
中,
,
,点D是
上一个动点(不与B、C重合),在
上取E点,使![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be3b58a4087b4a569572d93feceaec1b.png)
(1)求证:
;
(2)若
,求
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c2e679d7b314ff58c284da08e8edbb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be3b58a4087b4a569572d93feceaec1b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/6/d7cc93ae-be38-41f2-8747-94bed8f56fbb.jpg?resizew=161)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbfb7665a54463b68487b6c53cdd97b3.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfb08f6a798dc293f3d8de281190f65e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
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解答题-问答题
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【推荐2】如图,△ABC中,∠B=60°,∠C=75°,AC=3
,求AB的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e051d14fd6a787387995331f5e6d026.png)
![](https://img.xkw.com/dksih/QBM/2018/11/9/2072001318305792/2136443355725824/STEM/06c7395aea9e40e3b9d4bde7865efaf9.png?resizew=107)
您最近一年使用:0次
解答题-作图题
|
较易
(0.85)
【推荐1】如图所示,要把破残的圆片复制完整.已知弧上的三点A、B、C.
(1)用尺规作图法找出弧
所在圆的圆心O.(保留作图痕迹,不写作法)
(2)设
是等腰三角形,底边
,腰
.求圆片的半径R.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/13/bf045297-9c43-4740-80e8-7e28b4430acb.png?resizew=150)
(1)用尺规作图法找出弧
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/277c9aa45937360f37030f63ce8b10d5.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62a5b342a70f7d52c3a2f8d891745e5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6850a299395c314b8f8f2f8ca50c9895.png)
您最近一年使用:0次
解答题-证明题
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【推荐1】如图,
是
的直径,C 是
上一点,过点 C作
,垂足为E,交
于点 D ,连接
、
、
,过点B作直线交
的延长线于F,使得
.
是
的切线;
(2)若
,
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eaddff0d6293e96a5bee7f0203911ae1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82b74e2b6dae540571fdd509c4e966b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8295f78257bcfb0ee1057f384813b5d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41d99c3198b2062cd0c4e0c84f68784c.png)
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解答题-作图题
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(0.85)
【推荐2】将线段
放在正方形网格中,点A、点B均在格点上.请你分别按要求在下图中画点C(点C在格点上).
![](https://img.xkw.com/dksih/QBM/2021/4/1/2690639292989440/2697723754029056/STEM/75ccbec4-279a-4935-8e3f-9181ff97ff67.png)
(1)在图1中画
,使得
的值为
;
(2)在图2中画
,使得
的值为1;
(3)在图3中画钝角
,使得
的值为
(请画出2种不同的图形).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/2021/4/1/2690639292989440/2697723754029056/STEM/75ccbec4-279a-4935-8e3f-9181ff97ff67.png)
(1)在图1中画
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ab6990b8426a4c952f6b9ad99e9f188.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
(2)在图2中画
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ab6990b8426a4c952f6b9ad99e9f188.png)
(3)在图3中画钝角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bd172042ed396eb8ff692912613fb2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
您最近一年使用:0次