SOLUTION: A hot-air balloon travels round the Earth 1km above the surface, following the equator. How much further does it travel than the distance around the equator?

Question 712667: A hot-air balloon travels round the Earth 1km above the surface, following the equator. How much further does it travel than the distance around the equator?
Answer by Simnepi(216) (Show Source): You can put this solution on YOUR website!
because circumference = 2 * pi * radius
and the difference in the diameter of the earth and the path travelled by the balloon is 1km
so the balloon travels an extra 2 * pi * 1km
using a calculator this is 6.28318530718km
rounding this to the nearest metre gives
6.283km
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