The size of the Earth: The radius of the Earth is approximately 4000 miles. a. How far is it around the equator? (Hint: You are looking for the circumference of a circle.) b. What is the volume of...

The size of the Earth: The radius of the Earth is approximately 4000 miles.

a. How far is it around the equator? (Hint: You are looking for the circumference of a circle.)

b. What is the volume of the Earth? (Note:The volume of a sphere of radius r is given by 4 3π r3.)

c. What is the surface area of the Earth? (Note: The surface area of a sphere of radius r is given by 4πr2.)