"In Figure, bisectors of `/_B\ a n d\ /_D` of quadrilateral `A B C D` meet `C D\ a n d\
Channel: Doubtnut
Date: 2020-06-28

"In Figure, bisectors of `/_B\ a n d\ /_D`
 of quadrilateral `A B C D`
 meet `C D\ a n d\ A B`
 produced at `P\ a n d\ Q`
 respectively. Prove that `/_P+/_Q=1/2(/_A B C+/_A D C)dot`"