Earth's radius is about 1080 mi. About 70% of Earth's surface is water. How many square miles of water are on Earth's surface? Leave your answer in terms of


π

1 answer

The total surface area of Earth can be found using the formula for the surface area of a sphere:

Surface area = 4πr^2

where r is the radius of Earth.

Surface area = 4π(1080)^2

Surface area = 4π(1,166,400)

Surface area = 4,622,848π

Since 70% of Earth's surface is water, we can multiply the total surface area by 0.7 to find the amount of water:

Water area = 0.7(4,622,848π)

Water area = 3,235,993.6π

Therefore, there are approximately 3,235,993.6π square miles of water on Earth's surface.