Q6 of 51 Page 26

Show that the four points having position vectors are not coplanar.

Formula : -


andthen,



andthen



Given: -






The four points are coplaner if vector AB⃗,AC⃗,AD⃗ are coplanar.



now, using



= 10(100 + 72) + 12( – 60 – 24) – 4( – 72 + 40) = 840


≠0.


hence the point are not coplanar


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