0
-25
25
20
If the position vectors of A and B are
√14
√29
√43
√53
The projection of the vector
5/√3
10/√6
5/√6
10/√3
30
60
90
16
8
3
12
180o
90o
0o
45o
1
2
4
If the vectors are perpendicular, then λ is
-14
7
14
1/7
If θ is the angle between two vectors only when
0 < θ < π/2
0 ≤ θ ≤ π/2
0 < θ < π
0 ≤ θ ≤ π
Find the angle θ between the vectors
sin-1(1/3)
sin-1(-1/3)
cos-1(1/3)
cos-1(-1/3)