如图,点P是∠ABC内一点.
![](https://img.xkw.com/dksih/QBM/2018/2/12/1880543328673792/1880909725630464/STEM/e6233a964e2b4986a7ff760cfcd66e33.png?resizew=174)
(1)画图:①过点P画BC的垂线,垂足为D;②过点P画BC的平行线交AB于点E,过点P画AB的平行线交BC于点F.
(2)∠EPF等于∠B吗?为什么?
(3)请你用直尺和圆规作图,作一个角,使它等于2∠ABC.(要求用尺规作图,不必写作法,但要保留作图痕迹)
![](https://img.xkw.com/dksih/QBM/2018/2/12/1880543328673792/1880909725630464/STEM/e6233a964e2b4986a7ff760cfcd66e33.png?resizew=174)
(1)画图:①过点P画BC的垂线,垂足为D;②过点P画BC的平行线交AB于点E,过点P画AB的平行线交BC于点F.
(2)∠EPF等于∠B吗?为什么?
(3)请你用直尺和圆规作图,作一个角,使它等于2∠ABC.(要求用尺规作图,不必写作法,但要保留作图痕迹)
更新时间:2018-02-12 20:23:32
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【推荐1】如图,在每个小正方形的边长为
的网格中,
内接于圆,且顶点
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均在格点上,点
是圆与格线的交点,
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的长度为______;
(2)请用无刻度直尺在网格中作出
外接圆的圆心
;(保留作图痕迹,不要求写作法)
(3)请用无刻度直尺在网格中作出过
点的圆的切线
.(保留作图痕迹,不要求写作法)
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(2)请用无刻度直尺在网格中作出
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(3)请用无刻度直尺在网格中作出过
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【推荐2】如图,某小区绿化带△ABC内部有两个喷水臂P、Q,现欲在△ABC内部建一个水泵O,使得水泵O到BA,BC的距离相等,且到两个嘈水管P、Q的距离也相等,请你在图中标出水泵O的位置(保留作图痕迹).
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