如图,E是△ABC的内心,AE的延长线交△ABC的外接圆于点D.
(1)BD与DE相等吗?为什么?
(2)若∠BAC=90°,DE=4,求△ABC外接圆的半径.
![](https://img.xkw.com/dksih/QBM/2018/11/16/2076734636990464/2083102678450176/STEM/12b0a5b6be874503b80d65aba547deb4.png?resizew=149)
18-19九年级上·江苏泰州·期中 查看更多[4]
【校级联考】江苏省泰州市兴化市2019届九年级上学期期中考试数学试题人教版2020年九年级上数学 24.2.2 直线和圆的位置关系 课时3 切线长定理及三角形的内切圆(已下线)练习8 三角形的内切圆与内心-2020-2021学年【补习教材·寒假作业】九年级数学(苏科版)(已下线)专题3.8 圆周角和圆心角的关系(专项练习)-2021-2022学年九年级数学下册基础知识专项讲练(北师大版)
更新时间:2018-11-25 12:26:09
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适中
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【推荐1】如图,在
中,
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(1)若
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(2)若
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适中
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【推荐2】如图,在
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.
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【推荐1】如图,C为线段
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【推荐1】如图,
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(2)若
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【推荐2】如图,等边△ABC内接于⊙O,P是
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(2)探究PA、PB、PM之间的关系
(3)若PA=1,PB=2,求四边形PBCM的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
(1)求∠APC和∠BPC的度数
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解答题-作图题
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【推荐1】阅读与思考
下面是小航同学的数学反思,请仔细阅读,并完成相应的任务 .
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,由勾股定理知BC的长度为
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(3)反思3:如图6,在直角坐标系中,点M的坐标为
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是等腰三角形,则点N的坐标为______ .
下面是小航同学的数学反思,请仔细阅读,并完成相应的任务 .
如图1,以单位长度为边长画一个正方形,以原点为圆心,正方形的对角线为半径画弧,与正半轴的交点就表示![]() ![]() ![]() 通过查阅资料,类似的,以 ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]()
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(2)反思2:如图5,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
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解答题-作图题
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【推荐2】如图,在
中,
.
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的外接圆
;作
的角平分线交
于点
,连接
;(不写作法,保留作图痕迹)
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,
,求
的长.
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/17/11796ec0-60a3-4592-b6f1-c8af1e6a8850.png?resizew=112)
(1)利用尺规:作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
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