Insert a number for the radius or diameter. When answering if you want radius or diameter, and if you want to use it again, always use uppercase. Don’t enter a number in text (Ten, Eight, Twenty-five...) Enter it as a number. (10, 8, 25...) Don’t add any other text (10 cm, 8 inches, 25 feet...) Leave it as it is (10, 8, 25...) Click the cat to play again. If you have a very large number, it says infinity.