I've been given this question and am struggling to complete it.
Relative to a fixed origin, O, the points A and B have position vectors
(i + 5j -1k) and (6i + 3j - 6k) respectively
Find in exact, simplified form,
(i) the cosine of angle AOB - i have done this and it comes out as root 3 over 3
(ii) the area of the triangle
(iii) the shortest distance from A to the line OB
Any help on this would be very much appreciated. Thanks