How many square feet cover the earth?

Answer 1

You could use the formula for surface area of a sphere to solve this.

Using google, I found the diameter of the earth is 12756.3 km, which is equal to 41,851,378 ft. So the radius is 20,925,689 ft.

The formula for surface area of a sphere is 4pi r².

So the square feet covering the earth is 4pi(20,925,689)² square feet.

This is approx. equal to 5.5026 * 10^15 square feet.

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Answer 2

The Earth is a sphere. Use the area for a sphere if you know either the radius, diameter, or circumference.
Otherwise, you'd have to go around and find all critters with square feet and count them. Mine ain't square by the way, and duck feet are more triangular.

Answer 3

Radius of the earth=4000 miles
=4000*5280 ft
=21,120,000 ft
Surface area of a sphere
=4*pi*r^2
=4*pi*21,120,000^2
=5.6052*10^15 sq.ft.

Answer 4

Well its quite simple. We know that the radius of the earth is 6400Km and earth is considered to be a sphere. So surface area of a sphere is 2(pi)r*r where 'r' is the radius of earth.

Answer 5

Figure it out. The earth's circumference is 25,000 miles, and the area will be the circumference times the diameter. Don't forget to convert miles to feet (x5280).

Answer 6

The world ocean has an area of about 139,400,000 sq mi (361,000,000 sq km). This is about 71% of the Earth's surface, pretty substantial.