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The circumference of a 21km circle is: 65.97 km (C = d x Pi).
21km/h
21km is 21,000m = 2,100,000cm
42 pi km ~ 131.946891
21,000 meters (1000m per km).
21km
what is the 21 km north east feathers-ton
7km
21km
The driving distance is 13 miles / 21km using the E44 and E311.
1m = 100cm 1km = 1000m So .21km = .21 * 1000 * 100 = 21000 cm
Mars has the largest mountain in the Solar System, Olympus Mons. 600KM in diameter and 21KM high. (370Miles by 13Miles)