Awsome arrow tutorial

You've all seen 'em - those neat arrows turned 45 degrees, pointing at interesting things, included as design elements, helpfully populating signage...

There's something about the proportions of this particular style of arrow that has always really really appealed to me. I like them a lot. So I decided to figure out the correct proportions for myself, so I could make as many as I wanted... and I decided to post this quick visual tutorial which breaks the negative space around the arrow up in to a combination of squares and right-triangles to make it easy for you to make them too.