Show that four points whose position vectors are are coplanar.

Question

Philoid · Accepted Answer

Formula : -

and then

(iii) Three vectorsare coplanar if and only if

(iv) If andthen,

let

The four points are coplanar if the vector are coplanar.

now, using

= 10(100 + 12) + 12( – 60 – 24) – 4( – 12 + 40) = 0.

hence the point are coplanar