The inner diameter (distance across) of the tube when fully inflated is 20" (50cm) and the outer diameter of the tube when fully inflated is 41" (102.5cm).
What is the inner circumference of the tube?
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The inner diameter (distance across) of the tube when fully inflated is 20" (50cm) and the outer diameter of the tube when fully inflated is 41" (102.5cm).