如图,一副三角板的两个直角顶点重合在一起.
![](https://img.xkw.com/dksih/QBM/2021/1/19/2639414025986048/2644649771270144/STEM/23525bcb-0747-43a3-b661-1c039d2cb1dc.png?resizew=200)
(1)比较
与
的大小,并说明理由;
(2)若
,求
的度数.
![](https://img.xkw.com/dksih/QBM/2021/1/19/2639414025986048/2644649771270144/STEM/23525bcb-0747-43a3-b661-1c039d2cb1dc.png?resizew=200)
(1)比较
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52476a7d32cd4f1674e6f7b4b6211d1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff99813a6723040fb909784a3c94c673.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f63df44cb98f9e37987669324399bad7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27580ae2a9827b124a93196ec537e857.png)
20-21七年级上·云南保山·期末 查看更多[2]
更新时间:2021-01-26 21:36:38
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解答题-问答题
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【推荐1】如图,直线
相交于点O,过点O作
,射线
平分
,
.
(1)
的度数;
(2)
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e85814f051a479a1b04a46f70e96557a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/178e3fa2e4de57a4c067e79be7d798e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/177044a4fa3e522b850dc4baf7da34c2.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc9f91270ddbe1cf3c1362e1b95aee14.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75f55c6ac896ab4277fae2230a6e10b0.png)
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【推荐2】如图,已知∠AOB=40°,∠BOC=3∠AOB,OD平分∠AOC,求∠COD的度数.
![](https://img.xkw.com/dksih/QBM/2020/1/8/2372634576060416/2374121981575168/STEM/bd458bc19e704ef09823b08bd237916f.png?resizew=206)
解:∵∠BOC=3∠_____,∠AOB=40°,
∴∠BOC=_____°,
∴∠AOC=_____+_____,
∴∠AOC=160°,
∵OD平分∠AOC,
∴∠COD=
_____=_____°,
![](https://img.xkw.com/dksih/QBM/2020/1/8/2372634576060416/2374121981575168/STEM/bd458bc19e704ef09823b08bd237916f.png?resizew=206)
解:∵∠BOC=3∠_____,∠AOB=40°,
∴∠BOC=_____°,
∴∠AOC=_____+_____,
∴∠AOC=160°,
∵OD平分∠AOC,
∴∠COD=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
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解答题-作图题
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【推荐1】如图,已知不在同一条直线上的三点A,B,C.
(1)按下列要求作图(用尺规作图,不要求写做法,但要保留作图痕迹,并书写结论)
①分别作射线BA,线段AC;
②在线段BA的延长线上作AD=AC.
(2)若∠CAD比∠CAB大100°,则∠CAB的度数为 .
(1)按下列要求作图(用尺规作图,不要求写做法,但要保留作图痕迹,并书写结论)
①分别作射线BA,线段AC;
②在线段BA的延长线上作AD=AC.
(2)若∠CAD比∠CAB大100°,则∠CAB的度数为 .
![](https://img.xkw.com/dksih/QBM/2019/1/23/2124775963156480/2127195881717761/STEM/1cabc75580c84b4f824212ae2ab93f36.png?resizew=96)
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解答题-证明题
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【推荐1】如图,在
中,
,过点
作
,
平分
交AD于点D,交
于点
.试说明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ed8f7d3d7043d4b1eb98fc5c4e2fcd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9060f03b9ee41d70d135b1e1a8902ce9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd4f137168291e38b45977c3369d7bbf.png)
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【推荐2】如图所示,直线
与
相交于点
.
的余角是_________;(写一个即可)
(2)
_________;(写一个即可)
(3)如果
,那么根据________,可得
________;
(4)如果
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04616855f5fc6c411bcfb2107904e848.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/778d3556c2454a733a15629af5c2444f.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08991e33572d0a7a830db8de33b88fe9.png)
(3)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/322ee4e4eea934a85d4c11e934eb23c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12e515787ebe97ed2662237d9ca51ea1.png)
(4)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a62ad463ca6dd87bc13846b2cba806b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b2557547eecdc826b8282058802d217.png)
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