Q. 135.0( 1 Vote )

Find for which the points A(3, 2, 1), B(4, λ, 5), C(4, 2, – 2) and D(6, 5, – 1) are coplanar.

Answer :

Formula: -


and then,





let position vector of



position vector of



position vector of



position vector of



The four points are coplanar if the vector are coplanar






now, using



1(9) – (λ – 2)( – 2 + 9) + 4(3 – 0) = 0


7λ = 35


λ = 5


Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Related Videos
Lecture on Product of DeterminantsLecture on Product of DeterminantsLecture on Product of Determinants58 mins
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
caricature
view all courses