Do not have any nine inch round cake pans what can be used instead?

If you don't have a nine-inch round cake pan, you can use an eight-inch round pan, though the cake may be slightly taller and require a longer baking time. Alternatively, a 9x5-inch loaf pan or an 11x7-inch rectangular pan can work, but you may need to adjust the baking time. Just ensure to monitor the cake closely for doneness.