Relating a small increase in a circle's circumference to the corresponding increase in its radius (independent of the circle's absolute size).
For the Equator, circumference C1=2*pi*R1=40,000 km. The second band has circumference C2=C1+15 m=40,000.015 km, held at height h above the first band, so C2=2*pi*(R1+h). Subtracting:...
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