"`A B C D E` is a regular pentagon. The bisector of `/_A` of the pentagon meets the
Channel: Doubtnut
Date: 2020-06-28

"`A B C D E`
 is a regular pentagon. The bisector of `/_A`
 of the pentagon meets the side `C D`
 in `Mdot`
 Show that `/_A M C=90^0dot`"