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      Question

      What is the approximate circumference of Earth at the

      equator?
      A 40,000 km Correct Answer Incorrect Answer
      B 60,000 km Correct Answer Incorrect Answer
      C 80,000 km Correct Answer Incorrect Answer
      D 100,000 km Correct Answer Incorrect Answer

      Solution

      The Earth's circumference measures approximately 40,075 km at the equator. As an oblate spheroid, Earth is slightly flattened at the poles (with a polar circumference of about 40,008 km) and bulges at the equator. The equatorial diameter is approximately 12,742 km.

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