This site introduces problems of Sansue, i.e. mathematics which Japanese schoolchildren learn at elementary school. Problems are selected mainly from entrance examinations of famous junior high schools for 6th grade Japanese schoolchildren (12 years old) to take. We found Sansue is not only one of subjects at school but one of Japanese culture. Please enjoy Japanese Sansue culture.
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J.28 Paper tape around the equator of the earth
Find the area (km2) of the paper tape when an 8 cm wide paper tape is wound around the equator of the earth one round. Noted that the earth is to be a sphere radius 6400 km. The answer should be rounded off the 2nd decimal place.