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Q: The earth's radius is approximately _____.
  • A. 6,070 km
  • B. 6,170 km
  • C. 6,270 km
  • D. 6,370 km
Correct Answer: Option D - The radius of earth at the equator is 3,963 miles (6,378 kilometers), according to NASA's Goddard space flight center. Earth polar radius is 3.950 miles (6,356 km). Using those measurements, the equatorial circumference of earth is about 24,901 miles (40,075 km). The total surface area of Earth is about 197 million square miles (510 million square km).
D. The radius of earth at the equator is 3,963 miles (6,378 kilometers), according to NASA's Goddard space flight center. Earth polar radius is 3.950 miles (6,356 km). Using those measurements, the equatorial circumference of earth is about 24,901 miles (40,075 km). The total surface area of Earth is about 197 million square miles (510 million square km).

Explanations:

The radius of earth at the equator is 3,963 miles (6,378 kilometers), according to NASA's Goddard space flight center. Earth polar radius is 3.950 miles (6,356 km). Using those measurements, the equatorial circumference of earth is about 24,901 miles (40,075 km). The total surface area of Earth is about 197 million square miles (510 million square km).