如图所示,已知点P是△ABC三条角平分线的交点,PD⊥AB,若PD=5,△ABC的周长为20,求△ABC的面积.
![](https://img.xkw.com/dksih/QBM/2019/11/4/2326613942435840/2328923799011328/STEM/788eba0cb09a4d6ba6f8ac8aefffef61.png?resizew=194)
更新时间:2019-11-07 19:50:30
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解答题-证明题
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【推荐1】如图,在△ABC中,AB=AC,AM是∠BAC的角平分线,且ME⊥AB,MF⊥AC,求证:BM=CM,BE=CF.
![](https://img.xkw.com/dksih/QBM/2020/11/2/2583865227411456/2587987440975872/STEM/4d4f593d-5c24-4011-ba8f-02f066ea6281.png?resizew=137)
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解答题-作图题
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【推荐2】请用直尺、圆规作图,不写作法,但要保留作图痕迹.
已知:
,
求作:
,使得
在
边上,且它到
、
两边的距离相等.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/5/9897ea8e-a60a-48d2-a2ba-9e3c3ba4870c.png?resizew=160)
已知:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
求作:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e40ebc246e3d98ab1139375b26f04d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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