Are the four points A(1,-1,1), B(-1,1,1), C(1,1,1) and D(2,-3,4) coplanar? Share with your friends Share 0 Muskaan Talwar answered this Dear Student, Given A1,-1,1, B-1,1,1, C1,1,1, D2,-3,4Now, AB→=position vector of B-position vector of AAB→=-i^+j^+k^-i^-j^+k^=-2i^+2j^AC→=position vector of C-position vector of AAC→=i^+j^+k^-i^-j^+k^=2j^AD→=position vector of D-position vector of AAD→=2i^-3j^+4k^-i^-j^+k^=i^-2j^+3k^Now, AB→ AC→ AD→=-2200201-23=2-2013 expanding along R2=2-6-0=-12≠0Thus the points are not coplanar. Regards 0 View Full Answer
