How to calculate the fourth vertex of a parallelogram

[mercuryman]

given 3 vectors : a=(1,3,4) b=(2,5,3) c=(1,0,0)

 

[tiny-tim]

welcome to pf!

hi mercuryman! welcome to pf!

given 3 vectors : a=(1,3,4) b=(2,5,3) c=(1,0,0)

tell us what you think

 

[tiny-tim]

hi mercuryman!

Hi
I've marked the unknown vertex d=(x,y,z)
and tried to calculate its values by the fact that AB=CD and AC=BD and I'm missing something.. can u help?

do you know what vectors are?

if so, use AB = B - A etc