The radius of the earth is 3963 mi. what is the surface area of the earth in square meters? (1 mi = 1609 m.)'

You can think of the earth as almost a sphere(although its not sphere, but a little bit flat at the poles) for this case and then use the formula for finding the surface area of the sphere.

The surface area of the earth in square meters is 510940227330702.3 square meters or

The surface area of a sphere with radius of r units is

Since the radius of the earth is approx 3963 miles, and we have

1 mi = 1609 m approximately, thus,

Thus, surface area of the earth would be approximately

(here we made assumption that earth is perfect sphere with radius 3963 miles which isn't true, so this area is like hypothetical but it gives a rough idea of how big the surface area can be)

Thus,

The surface area of the earth in square meters is 510940227330702.3 square meters approx or

Learn  more about surface area of sphere here:

link

Surface Area of a Sphere = 4 • π • radius²

Surface Area of a Sphere = 4 * 3.14159 * 3,693*3,693

Surface Area = 171,383,146.70 square miles

1 square mile = 1,609 * 1,609 = 2,588,881 square meters

171,383,146.70 square miles * 2,588,881 = 4.437 x 10^14 square meters

the answer is b