I use round cake pans--I just measured the diameter and it is 9". If it's the wrong size, it will just be thinner/thicker though (and you can adjust the baking time accordingly).
This was good. I did change the recipe a bit, since I didn't have any cauliflower or broccoli, I used some potatoes and peas on top of the carrots, celery, onions, etc.
The second time I made it, I made some sourdough pancakes (just sourdough starter, oil and salt) to go with it, since I don't have the stuff to make the traditional injera. It's perfect!
Spice Cake