如图,已知
是
的直径,点
在
上,
且
,过点
作
交
于点
,垂足为
.
的度数为______;
(2)求
的长;
(3)求阴影部分的面积.
![](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/5aa69fd8445d01c98634c2e885b47d5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d4d00b86b2f067b902baf6e52f0faab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b836a0f9c491f85767e8f6695576fd5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21b28f28ced0531d1df34fcf04c6c67f.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
(3)求阴影部分的面积.
更新时间:2024-04-15 14:05:26
|
相似题推荐
解答题-证明题
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【推荐1】如图,在△ABC中,∠ACB=90°,AC=BC,延长AB至点D,使DB=AB,连接CD,以CD为直角边作等腰直角三角形CDE,其中∠DCE=90°,连接BE.
![](https://img.xkw.com/dksih/QBM/2015/11/18/1573928967962624/1573928973991936/STEM/710b1b1156f34cabaa20ef16b10330c7.png)
(1)求证:AD=BE;
(2)若AC="3" cm,则BE= cm.
![](https://img.xkw.com/dksih/QBM/2015/11/18/1573928967962624/1573928973991936/STEM/710b1b1156f34cabaa20ef16b10330c7.png)
(1)求证:AD=BE;
(2)若AC="3" cm,则BE= cm.
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【推荐2】如图,等腰三角形
中,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b584d1821ba746a5b2937bbb589bb169.png)
.作
于点
,将线段
绕着点
逆时针旋转角
后得到线段
,连接
.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/787ac5e13622afab5e9f8603afe42356.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ab41054fa9ce51b68e78d9c0cf398d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b584d1821ba746a5b2937bbb589bb169.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6b41d4070854edfaa24071137b314cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70bd4dab3c4989a919f742214ad2adc0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/15/aaea914b-fc76-455c-983d-68b14f4d0828.png?resizew=129)
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【推荐1】如图,
是
的直径,
与
相切于点
,交
的延长线于点
,连接
,
,过点
作
于点
.
;
(2)若
,求证:
;
(3)在(2)的条件下,若点
是
上一点(不与
,
,
重合),连接
,
,求证:
.
![](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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f913298f0fae9f55377a8deab9f099dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7178f1022e05638a818208b3141f0795.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a504c04858abffe2f2e745f92935991.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7664e93002bab90b025734bf58143cde.png)
(3)在(2)的条件下,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eb30ca8a27f85a1efb2e12e70bb6bc9.png)
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【推荐2】如图1,AB是
的直径,点C在
上,D是弧CB的中点,连接OD、AC.
![](https://img.xkw.com/dksih/QBM/2022/4/7/2952977132650496/2957224401543168/STEM/b70e5b2a-35ee-477b-89d3-76beeb31eaba.png?resizew=505)
(1)求证:OD∥AC
(2)如图2,过点D作DE⊥AB于H,交
于点E,连接CE交AB于点F,求证:AC=AF
(3)如图3,在(2)的条件下,延长DO交
于点N,交CE于点G,连接BN交CE于点M,连接OM、CD,若FG=2ME,△OMB的面积是
,求弦CD的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://img.xkw.com/dksih/QBM/2022/4/7/2952977132650496/2957224401543168/STEM/b70e5b2a-35ee-477b-89d3-76beeb31eaba.png?resizew=505)
(1)求证:OD∥AC
(2)如图2,过点D作DE⊥AB于H,交
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(3)如图3,在(2)的条件下,延长DO交
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e609d7f5a3b904e30f43fbbc26033d7.png)
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适中
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【推荐1】圆是一个很有意思的图形,关于圆的面积计算也有很多巧妙的方法,让我们一起来学习与尝试吧!
我有发现:(1)亮亮巧用“
”求出下图中圆的面积.
他的解题思路是:因为正方形的边长等于圆的半径,那么正方形的面积正好是
,因此圆的面积是( )平方厘米.你瞧!半径不知道,但是
已经知道,也能求出圆的面积.
厘米,以直角顶点为圆心,直角边为半径画一个
圆,再以直角三角形斜边的中点为圆心,斜边为直径画一个圆.图中阴影部分的面积是多少平方厘米?
我有发现:(1)亮亮巧用“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d3944ec0d136c4a50183942b1ff60ac.png)
他的解题思路是:因为正方形的边长等于圆的半径,那么正方形的面积正好是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d3944ec0d136c4a50183942b1ff60ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d3944ec0d136c4a50183942b1ff60ac.png)
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【推荐2】如图,
是
的直径,
与
交于点
,弦
平分
,点
在
上,连接
.
与
相切;②
中选择一个作为已知条件,另一个作为结论,已知:______,结论:______.将题目补充完整(填写序号),并完成证明过程;
(2)在(1)的前提条件下,若
,点
是
的中点,求阴影部分的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68fbbd17c89f03dbb61cd6ffdb9a0344.png)
(2)在(1)的前提条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae341f580ff8fbf21f616fe900b0e4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6f9353ca110c8b81561455b232dbc15.png)
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