# Thread: Ordered triple of a vector

1. ## Ordered triple of a vector

Find an ordered triple of a vector $a\rightharpoonup$ so that $a\rightharpoonup$ is perpendicular to the plane containing the points B(0, 0, 0), C(5, 3, 7), and D(-5, 7, 4).

No idea where to start, and my book isn't helping much...

Thanks!

2. Originally Posted by Failbait
Find an ordered triple of a vector $a\rightharpoonup$ so that $a\rightharpoonup$ is perpendicular to the plane containing the points B(0, 0, 0), C(5, 3, 7), and D(-5, 7, 4).

No idea where to start, and my book isn't helping much...

Thanks!
get the vectors BC and CD..
get their cross product..
the resulting vector is perpendicular to both BC and CD, and hence perpendicular to the plane that contains B, C and D. Ü

### what is a vector ordered triple

Click on a term to search for related topics.