Help me with a vector task

[sky_tm]

vector 4

Given position vector of two points A, B and C are \[\underline a = 2i - j + k\] and \[\underline b = 2i + j + 3k\] and \[\underline c = i - 3j + k\]

i) find the distance between A and B
ii) find the angle between \[\underline a - \underline b \] and \[\underline a + \underline b \].
iii) find a unit vector perpendicular to the plane containing A, B, C.
iv) find the Projection of AC along AB.

 

[bboyrichard]

Re: vector 4

To find out the distance of two points is just to find the sqrt of the sum of the square of the differences in each axis. For the rest of the questions, look into simple vector book should help you