Mel Bartholomew invented Square Foot Gardening to make more efficient use of a garden plot. It's also easier to plan "one square foot" of garden, compared to "how do I fill a 20x20' garden with plants"?
My article shows how geometry gives more creative options than a simple rectangular garden plot, and also the optimum spacing for plants within each individual square.
Here's a photo of a simple planning tool: put some circles into a square and see how they may fit.
One Writing Tip for Geometry
That was not my first attempt to illustrate the technique!
I had naively tried to fit the circles touching the two diagonal corners of the square. So the larger red circles bulged out of that enclosure! I actually published that image, also, and explained what that would mean for gardening. Follow the link to my article to how I handled that!
So today's writing tip is to actually test what you plan to recommend, by following your own directions. It's okay to surprise yourself; just don't make your readers suffer for it.
As always, I also publicized my Decoded... article in DeHaan Services. I'd published my original images in "Previewing One Example of Applied Geometry" to establish my copyright before they would appear in Decoded Plants.