The earth is approximately a sphere. It's diameter is about 12730km. Water covers approximately 66% of the earths surface. How many square kilometers of land covers the earths?
a = pi d^2 = pi * 12730^2 = 5.09*10^8
66% of that is 3.36*10^8
Thank you Steve
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To calculate the total land area of the Earth, we need to subtract the water-covered area from the total surface area.
First, let's find the total surface area of the Earth. The formula to calculate the surface area of a sphere is:
Surface Area = 4 * π * r²
Given that the diameter of the Earth is approximately 12730 km, we can find the radius (r) by dividing the diameter by 2:
Radius (r) = Diameter / 2 = 12730 km / 2 = 6365 km
Now, we can substitute this value for the radius and use the formula to calculate the total surface area:
Surface Area = 4 * π * (6365 km)²
To find the land area, we need to subtract the water-covered area from the total surface area. Given that water covers approximately 66% of the Earth's surface, we can calculate the water-covered area:
Water Area = Total Surface Area * (66 / 100)
Finally, we can find the land area by subtracting the water area from the total surface area:
Land Area = Total Surface Area - Water Area
By plugging in the values and performing the calculations, we can find the approximate land area of the Earth.