Originally Posted by

**Ulchie** I've been at this question for a few hours and I'm stuck. I really need to see someone show the work so I can finally understand and "get it".

In Figure (see attached picture), A, B, C, D, E, and F, are the vertices of a regular hexagon centered at the origin.

Express each of the following vectors in terms of a = vec(OA) and b = vec(OB):

a) vec(AB)

b) vec(BC)

c) vec(AD)

d) vec(CF)

e) vec(AC)

f) vec(BC) + vec(DE) + vec(FA)

I've tried for hours. I think a) I get vec(AB) = b - a

but on question b I also get b - a even though I know it should probably be -a

The rest I'm messed up on bad. But on question f) I think it should be = 0.

Can someone show me the work? I am so lost and yet this seems so easy. I just need to see how to do it properly so I can finally get it. This isn't for marks btw, it's just to learn.