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Question-145174




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  ⇒∠OCD=∠OCB=45°  ∠CFB=∠FED=∠FBD=45°=∠OCB  ⇒EF//OC
$${OD}={OB} \\ $$$${CD}={CB} \\ $$$$\Rightarrow\angle{OCD}=\angle{OCB}=\mathrm{45}° \\ $$$$\angle{CFB}=\angle{FED}=\angle{FBD}=\mathrm{45}°=\angle{OCB} \\ $$$$\Rightarrow{EF}//{OC} \\ $$
Commented by mr W last updated on 02/Jul/21
E mustn′t be midpoint of AD.
$${E}\:{mustn}'{t}\:{be}\:{midpoint}\:{of}\:{AD}. \\ $$
Commented by mathdanisur last updated on 02/Jul/21
a lot cool Ser, thankyou..
$${a}\:{lot}\:{cool}\:{Ser},\:{thankyou}.. \\ $$

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