Oct 23, 2013 Thread starter #1 Albert Well-known member Jan 25, 2013 1,225 A trapezoid ABCD ,AB//CD ,AD=BC Prove : $AC^2=AD^2+(AB).(CD)$

Oct 30, 2013 Thread starter #2 Albert Well-known member Jan 25, 2013 1,225 Re: Prove :AC^2=AD^2+(AB).(CD) Albert said: A trapezoid ABCD ,AB//CD ,AD=BC Prove : $AC^2=AD^2+(AB).(CD)$ Click to expand...

Re: Prove :AC^2=AD^2+(AB).(CD) Albert said: A trapezoid ABCD ,AB//CD ,AD=BC Prove : $AC^2=AD^2+(AB).(CD)$ Click to expand...