Thread: Two vector questions

Based on this diagram http://i55.tinypic.com/2w4wtio.jpg , what is the sum of: ->AB + ->ED + ->CA. Since they have to go head to tail and ED=BC would it be AB + BC + CA? This does not look right to me.

I hope I posted this in the correct forum and I apologize if I did not. Thanks.

The way you posted this makes very difficult to read.
If we know that is a parallelogram then

The base is a square.

Originally Posted by Jemde

The base is a square.

Good grief: A square is surely a parallelogram.

The base isn't really important. It looks to me like AB+ ED gives us AC. Adding CA takes us back to A. AB+ED+ CA is the 0 vector.

Originally Posted by Plato

Good grief: A square is surely a parallelogram.

I know I just thought I should mention it in case it was important. I've just started learning about vectors and I was not sure if you needed to know. Sorry if I caused any confusion. Thanks HallsofIvy and Plato I can see why it equals zero now.