In-a-quadrilateral-ABCD-it-is-given-that-AB-is-parallel-to-CD-and-the-diagonals-AC-and-BD-are-perpendicular-to-each-other-Show-that-a-AD-BC-AB-CD-b-AD-BC-AB-CD-

Question Number 22515 by Tinkutara last updated on 19/Oct/17

In a quadrilateral A B C D, it is given

that A B is parallel to C D and the

diagonals A C and B D are perpendicular

to each other .

Show that

(a) A D . B C ⩾ A B . C D;

(b) A D + B C ⩾ A B + C D .