如图,过⊙O外一点P引⊙O的两条切线PA、PB,切点分别是A、B,OP交⊙O于点C,点D是优弧
上不与点A、点C重合的一个动点,连接AD、CD,若∠APB=80°,则∠ADC的度数是 _____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0ff808cf596294204a404d0a34f3e3a.png)
![](https://img.xkw.com/dksih/QBM/2022/3/18/2938718166687744/2957257776521216/STEM/d233b72f-8668-457e-97bc-327d4ce76c56.png?resizew=172)
更新时间:2022-04-13 13:39:15
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【推荐1】下面是“作一个
角”的尺规作图过程.
请回答:该尺规作图的依据是_________________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/996bf3d35b6763cbc1a423b13a9df2dd.png)
已知:平面内一点A. 求作: ![]() ![]() ![]() 作法:如图, (1)作射线 ![]() (2)在射线 ![]() ![]() ![]() (3)以C为圆心, ![]() ![]() ![]() 则 ![]() |
请回答:该尺规作图的依据是
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【推荐2】如图,
是
的直径,
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的切线,
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___________ .
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【推荐1】如图,在矩形
中,
,
,以
为直径在矩形内作半圆,自点
作半圆的切线
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________ .
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【推荐2】如图,
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,
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