Q: A triangular shade cloth is to be suspended by 3 poles of different height as shown. The feet of the poles are positioned 10m from each other. Calculate the area of the shade cloth needed.

http://i.imgur.com/FU9E3d8.png

Could someone please draw in (or explain) the x,y,z axis so i can understand how to express AB--> and AC--> in i,j,k form.

thanks.