解答题-问答题 较易0.85 引用3 组卷115
如图,
中,
,
,点D是AC的中点,过点D作
交BC于点E,连接AE.若
,求BC的长.
![](https://img.xkw.com/dksih/QBM/2021/11/6/2845718151274496/2846891781160960/STEM/62f79a17-568a-4e94-ab33-c2eed673d681.png)
解:∵
.
∴
(_____________________________)
∵
,∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68e744f480e11f588570c5d6738799f5.svg)
∴
________________°
∵点D是AC的中点,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68fbbd17c89f03dbb61cd6ffdb9a0344.svg)
∴
(_____________________________)
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6e9e0417793b1afa51ba616bd060dd6.svg)
∴
________________°
∵在
中,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d3c9ce32b721995f355eea411340e3.svg)
∴
________________=________________
∴
________________.
![](https://img.xkw.com/dksih/QBM/2021/11/6/2845718151274496/2846891781160960/STEM/62f79a17-568a-4e94-ab33-c2eed673d681.png)
解:∵
∴
∵
∴
∵点D是AC的中点,且
∴
∴
∴
∵在
∴
∴
21-22八年级上·北京西城·期中
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