hello mohit you havent attached a pic, but i ll still ans the ques :)
AB+AC+AD+AE+AF=AB+(AC+AF)+AD+AE =AB+(AC+CD)+AD+AE [since AF=CD] =AB+AD+AD+AE =2AD+(AB+AE) =2AD+(ED+AE) [since AB=ED] =2AD+AD =3AD =3*(2AO) [since O is the center and AO=OD] =6AO
kindly approve :)
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