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The circumference of a rectangular prism cannot be determined with the given measurements of its sides. The circumference is the distance around a closed shape, such as a circle or an ellipse, and is not typically used to describe rectangular prisms.
If you are looking for the surface area or volume of the rectangular prism with sides of 9 cm, 5 cm, and 10 cm, please specify so that I can provide you with the correct calculations.