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Question Number 145174 by mathdanisur last updated on 02/Jul/21

Answered by mr W last updated on 02/Jul/21

Commented by mr W last updated on 02/Jul/21

$$OD=OB$$$$CD=CB$$$$\Rightarrow \mathrm{\angle }OCD=\mathrm{\angle }OCB=45°$$$$\mathrm{\angle }CFB=\mathrm{\angle }FED=\mathrm{\angle }FBD=45°=\mathrm{\angle }OCB$$$$\Rightarrow EF//OC$$

Commented by mr W last updated on 02/Jul/21

$$E{mustn}^{\prime }tbemidpointofAD.$$

Commented by mathdanisur last updated on 02/Jul/21

$$alotcoolSer,thankyou..$$

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