I don't know the units so I'm guessing its centimeters, you can convert it when I'm done. 31.847133758 is the exact answer in centimeters, you can use that to convert the units to millimeters and such.
The diameter of the trundle wheel is approximately 31.83 cm. This is calculated using the formula for the circumference of a circle, where the circumference is set to 1 meter. Therefore, the calculated diameter allows us to understand the wheel's size effectively.
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