About 70% of Earth’s surface is covered by water. If the diameter of Earth is about 12,750 km, find the area not covered by water to the nearest 100,000 km2.

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05-04-2017
Mathematics

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About 70% of Earth’s surface is covered by water. If the diameter of Earth is about 12,750 km, find the area not covered by water to the nearest 100,000 km2.

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wolf1728 wolf1728 · Answer 1 · 2017-04-05T04:51:40+02:00

Earth diameter = 12,750 km
Earth radius = 6,375 km
Sphere Surface Area =   4 • π • r²
Sphere Surface Area =    4 * 3.14159 * 6375^2
Sphere Surface Area =    4 * 3.14159 * 40,640,625
Earth's Entire Surface Area =    510,704,724 square kilometers
Surface NOT covered by water = 510,704,724 * .3
Surface NOT covered by water = 153,211,417 square kilometers