Great wall of China
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Actually the equatorial diameter of the planet is 7920 miles. The polar diameter is 7899 miles hence the equatorial circumference is greater than the polar circumference. Choose one then divide it by ten. (To obtain the circumference multiply the diameter by Pi whose value is 3.14159).
Another way of determining Pi is to use the fraction: 22 / 7
Another way of determining Pi is to use the fraction: 22 / 7
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The circumference of the earth is roughly 25,000 miles, so 1/10th would be 2500 miles.