Instruction: Generate an answer to the question by utilizing the information contained in the document.

Input:
Question: Is the whole thing 10" by 9", or are each of the 3 panels 10",  making it 30" by 9" total?
Document: Pros:The non-stick surface is easy to keep clean.And the manufacturer has rounded the edges of the panels.Cons:  However, the hinges that attach the panels together are extremely sharp and dangerous. And the whole thing is so thin and light weight that it actually moves around on the stove top. I ordered two and both had faulty hinges. Too much of a hassle to return.
The product is exactly as described, now with a rounded edge so that it won't cut your fingers. The aluminum is pretty thin but the guard still can stand on the stove well. The only thing that I wished is that it can be slightly taller (like 11"-12") instead of 9" (that is stated in the spec - 10"x9", so, I knew before I decided to buy it, as it is still better than the aluminum foil type of Splatter guard)
Each square is 9" in Height x 10" in Length. And if you open it entirely, it's 9" x 30". When I'm not using it, I have it spread wide open and covering the stove back (where the clock is). When I am using it for cooking, I wrap it around my frying pan and it catches splatter pretty well. I also love that it cleans really easy and stores away really small. I may even get another one in the future.
This thing is really small. The pan they use in the picture must be a 5 inch frying pan. I would need at least 2 for a normal 10 inch frying pan... It is of good quality.
Keeps my range top free of grease spatters, at least on 3 sides of the skillet. The teflon coating makes it eay to clean, and the tri-fold design makes it easy to drain in the dish drainer or to store away for the next use. It would be even better if each of the panels were 1 or 2 inches wider to wrap around a 12 inch skillet better.
These are inexpensive and save a whole lot of stovetop cleanup. We give them as gifts.
this is a terrible product. OMG couldn't you come up with something a little better. very dissatisfied with this whole order.
I love it keeps the mess down on my stove making much easier clean up my favorite type of splatter shield
the guard was what I expected; it does the job. I plan to order 3 more and give them as gifts to family members
So if the size works for you, I'd say don't be discouraged by the one-star reviews written 3 years ago.
Answer: Each panel is 10W by 9H.