(adsbygoogle = window.adsbygoogle || []).push({}); Please Help! nasty vector question

The diagonals of a plane quadrilateral ABCD intersect at O,and X,Y are the midpoints of the diagonals AC,BD respectively.Show that

The shape is not regular the top and bottom are different lengths as can be the sides

1)BA + BC= 2BX

Got this part by proving

BA=BX+XA

BC=BX+XC

BA+BC=BX+XA+BX+XC

2BX+XA+XC

2BX-1/2AC+1/2AC=BA+BC

From here on in I just go blank

I've tried proving no 2 by getting DA=DX+XA OR DY+YA etc but it ain't working

2)BA + BC +DA + DC=4YX

3)2AB +_2BC +2CA=0

iF 0A+OB+OC+OD=4OMfind location of M

Thanks in advance

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Nasty vector question

**Physics Forums | Science Articles, Homework Help, Discussion**