71% of 510,000,000 km2
= 71% * 510,000,000
= 0.71 * 510,000,000
= 362,100,000 km2
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You will have to convert it to square miles yourself, I use metric units. The surface area of Earth is 510 million Km2 This is broken into: Land 149 million Km2 Water 361 million Km2
30 ft * 17 ft = 510 sq ft = 47.38 sq metres
in trigo..180 degees = ∏ radians.. so 510 = 180*2+ 150 = 2∏ + 5∏/6 =17∏/6
10 x tan(51) = 12.349 (rounded) tan(510) = negative 0.5774 (rounded)