1 . 我们通过“三角形全等的判定”的学习,可以知道“两边和它们的夹角分别相等的两个三角形全等”是一个基本事实,用它可以判定两个三角形全等;而满足条件“两边和其中一边所对的角分别相等”的两个三角形却不一定全等.下面请你来探究“两边和其中一边所对的角分别相等的两个三角形不一定全等”.
探究:已知
,求作一个
,使
,
,
(即两边和其中一边所对的角分别相等).
(1)动手画图
请用尺规作图的方法完成下面的作图过程:
①画
;②在线段
的上方画
;③画
.
(2)观察
观察你画的图形,你会发现满足条件的三角形有______个;其中三角形______(根据自己作图标注的字母填三角形的名称)与
明显不全等;
(3)小结
经历以上探究过程,可得结论:______.
探究:已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7dab0c0c0f988903f228a6510208420.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bee49a6c527d9369f3963aa38787fef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a130e7c109e2196b97e1a76281bf3cf6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/26/c6911526-fd14-4993-a75b-0dee532faf5a.png?resizew=147)
(1)动手画图
请用尺规作图的方法完成下面的作图过程:
①画
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7dab0c0c0f988903f228a6510208420.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0215e13a9fb5574d5194aeb9507a98aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bee49a6c527d9369f3963aa38787fef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a130e7c109e2196b97e1a76281bf3cf6.png)
(2)观察
观察你画的图形,你会发现满足条件的三角形有______个;其中三角形______(根据自己作图标注的字母填三角形的名称)与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(3)小结
经历以上探究过程,可得结论:______.
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2 . 如图,
相交于点O,
,
,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f40340d3b1d7eba8ca69b28227ade8d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfb27272b4eb9ed057dd3b4d40697e7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00ada52a0dae5711ac607f5384b2532a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b50834e39c4e028e0fc303b94d571923.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/25/15cf531d-628b-45da-a129-3185806d21dd.png?resizew=159)
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名校
3 . 如图,将两根钢条
,
的中点
钉在一起,使
,
能绕点
自由转动,就做成一个测量工具,测
的长即等于内槽宽
,那么判定
的理由是( ).
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/7/11411e21-9eaa-48a4-9416-eefa1cc62c50.png?resizew=229)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6024fd4532f5f981deac4582c799a6ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6655cc150ddc9deba2254780984d0024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6024fd4532f5f981deac4582c799a6ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6655cc150ddc9deba2254780984d0024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb0628cecbfc98d390e5447d52414e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66c45a2a294fbaeb7fe656446baee8c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/7/11411e21-9eaa-48a4-9416-eefa1cc62c50.png?resizew=229)
A.SSS | B.AAS | C.SAS | D.HL |
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4 . 如图,C是
的中点,
,
.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c503e29373e8d87134bdb46bd3912910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54b4908b37cf23de34d38ae7a0bff278.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5eaffcd2070bfcb1955e2cab66c26c06.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/25/918ae9df-956e-4552-bb04-1e264af6025a.png?resizew=168)
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5 . 如图,
,
,
.
求证:
.
证明:∵
,
∴(___________).
又∵
,
∴
___________
,
即___________=___________
在
和
中,
,
∴
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a510a3eb906b3ef0760b0d1723d11ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd81adb13f5a7550b0f94f770900a613.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c55ee522f41c43253050e92b3c8de31.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/22/6bd79084-cc3f-4bd6-830f-84941f92bedb.png?resizew=117)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ca10806fc8c3c3efd6859f526b76900.png)
证明:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd81adb13f5a7550b0f94f770900a613.png)
∴(___________).
又∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c55ee522f41c43253050e92b3c8de31.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50625b22efce834456886a41b89672bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac175010746fd4c90a55cb9081a1ffb6.png)
即___________=___________
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c36379bb116e6ef8b0608e7f2ef72ec.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ca10806fc8c3c3efd6859f526b76900.png)
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6 . 如图,线段
、
相交于点O,且
,请添加一个条件使
,且以“
”为依据,则应添加的条件为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b2fb91028cda3644b82b04da29cbe52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638ab70ff1f1c4b3cb35025f06da5858.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5a290f047f50481318d040c604d72f7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/24/93e4cd1a-6576-4b3e-9ed4-265c74ac5e3a.png?resizew=107)
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7 . 如图,
,
,
,求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7465c3848d832ec772b6c1510d61aa59.png)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06a2ab6940dca62be1f3b2b5f8531990.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fb465a5bcb02aa188d4efe4fff51c2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7465c3848d832ec772b6c1510d61aa59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/23/b713a982-cf76-4ec2-a889-88d7f5dd6fda.png?resizew=181)
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8 . 如图,点E、F在
上,
,
,
.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1393308bc68322f50fa29702dd412263.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b8bee1c892473f71a723860b933e234.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c581dab991aeadf06d972e47673ea8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55198e4b9ab89a23bdb6278bafccb887.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/23/44c3e33e-0b3b-4ff8-8677-a79adc6ffa56.png?resizew=162)
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9 . 平面上有
与
,其中
与
相交于P点,如图,若
,
,
,则
的度数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbfa1a2af7e38d33634c462300df381f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43ce4cebe53d8e083cc8339a5e6ba3db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dfc059ebc028191cd7bc07979a14897.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abc36b560293b59ee54733e04b478f08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fbf1667b21a273bf5dd007d65eeda7c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/24/c0f49ab6-6c56-4fa7-a1c7-327bf3ba7404.png?resizew=189)
A.![]() | B.![]() | C.![]() | D.![]() |
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10 . 如图,点
,
在
上,
,
,
,
与
交于点
.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f805768a5ffaf8bdfa4bc3b680aafdc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfb27272b4eb9ed057dd3b4d40697e7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4354365ca0929f8a606ed0bf341e4ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e153e07a91c773708d981b1d18bbacf8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/23/c98fed45-48ca-41be-b4e7-f79d62458761.png?resizew=125)
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