Question

The radius of Earth is about 3960 miles. The radius of the moon is about 1080 miles. a. Find the surface area of Earth and the moon. Round your answer to the nearest tenth of a million. The surface area of the Earth is about million square miles and the surface area of the Moon is about million square miles. b. Compare the surface areas of Earth and the moon. Round your answer to the nearest tenth. The surface area of the Earth is about times greater than the surface area of the moon. c. About 70% of the surface of Earth is water. How many square miles of water are on Earth’s surface? Round your answer to the nearest tenth of a million. There are about million square miles of water on the Earth's surface.

Answer 1

A) The formula for surface area of a sphere is A = 4*PI*r^2

using 3.14 for PI:

Surface area for Earth = 4 * 3.14 x 3960^2 = 196,960,896 miles^2

Surface area of the moon: 4 * 3.14 * 1080^2 = 14,649,984 miles^2

B)Divide the Surface of the Earth by the moon:

196,960,896 / 14,649,984 = 13.44

The Earths surface is 13.4 times larger than the moon.

C) Multiply the surface of the Earth by 70%:

196,960,896 * 0.70 = 137,872,627.2 million square miles of water.