MATHEMATICS · Single correct · AP · AP Precalculus · Functions with Parameters, Vectors, and Matrices · Functions with Parameters, Vectors, and Matrices
Problem
The value of a , for which the points, A , B , C with position vectors 2i^−j^+k^ , i^−3j^−5k^ and ai^−3j^+k^ respectively are the vertices of a right angled triangle with C=2π are [AIEEE 2006]
(1) -2 and -1
(2) -2 and 1
(3) 2 and -1
(4) 2 and 1