一块三角形的材料被折断了一个角,余下的形状如图,请根据所剩的材料推算出所缺角的度数.(写出必要的文字说明及画出相应的图形.
![](https://img.xkw.com/dksih/QBM/2019/1/25/2126369058643968/2132702876639232/STEM/933eb482fce3465fb635948bf0f27128.png?resizew=175)
更新时间:2019-02-03 14:18:01
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【知识点】 三角形内角和定理的应用解读
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】我们定义:【概念理解】在一个三角形中,如果有一个角的度数是另一个角度数的4倍,那么这样的三角形我们称之为“完美三角形”.如:三个内角分别为
、
、
的三角形是“完美三角形”.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/4/e2677dcd-40a4-46b1-970b-10d964f7a25d.png?resizew=450)
(1)如图1,
,在射线
上找一点
,过点
作
交
于点
.
,
(填“是”或“不是”)“完美三角形”;
(2)如图2,∠BDC为钝角,点
在
的边
上,连接
,作
的平分线交
于点
,在
上取一点
,使
,
,若
是“完美三角形”,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cef5188670b78eecf710cdf8d080462f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d36581140ebac5d28438ea63b1b23b65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb0aa8a61380228e285f3b5c7b74c47.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/4/e2677dcd-40a4-46b1-970b-10d964f7a25d.png?resizew=450)
(1)如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8aabfa428a4a7c31db9a9225ab83fc2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79016e5cebdaf32a36945bbfc404da02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37a08b7c2080d0486acd1d8190fb8c0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1415e415ec7678b962af22b752faeea8.png)
(2)如图2,∠BDC为钝角,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3981e7286d41960daf4e110c1c84e03a.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/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/399468538671e0ed7b02ff020a190ffd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e779b4dbad5032b99a2df3b7dd46d3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f010b76578240c9efbbe0bc173d24714.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
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解答题-问答题
|
适中
(0.65)
【推荐2】如图,在
中,
与
的平分线相交于点
,
的外角.
与
的平分线交于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/19/b89068e1-0c07-496c-8b31-656a95c4fb3d.png?resizew=144)
(1)若
,求
的度数.
(2)试探索
与
之间的数量关系,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91471da4a77df63164169d4858666563.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f0e605e9bee106ad45212f8b90ab178.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/19/b89068e1-0c07-496c-8b31-656a95c4fb3d.png?resizew=144)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e702e136211878dce558e0457f15df63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19768d8c55deb4973820aeab7a224e6a.png)
(2)试探索
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/595522dfc96cc92f1d84ea0f298bb738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19768d8c55deb4973820aeab7a224e6a.png)
您最近一年使用:0次