Question

The Diameter of Earth is _____.
A. 12,756 kms
B. 14,000 kms
C. 40,000 kms
D. 11,000 kms

Answer 1

Hint: A diameter of a circle is a direct line passing. That means the middle of the circle and whose endpoints lie at the circle. It is double the circle's radius. In cutting-edge times, Earth's circumference has been used to outline essential gadgets of the dimension of length: the nautical mile inside the $17$th century and the meter within the eighteenth.

Complete answer:
The earth is almost but not a perfect sphere. It is slightly flattened as its equatorial radius is \[6378\] km, but its polar radius is \[6357\]km. The radius varies from \[6,378\]kilometers at the equator (\[3,963\]mi) to \[6,357\]kilometers at the pole (\[3,950\]mi). Among the results obtained by Eratosthenes, the calculation of the curvature of the Earth is by far the most common. The Eratosthenes method of calculating the diameter of the Earth has been lost, and the condensed version mentioned by Cleomedes to popularise the discovery has been preserved. No special equipment was needed to carry out this project. The diameter of the earth is \[12,756\]kms.
So, the correct answer is Option A.

Note: The difference in Earth’s diameter has often been important when it comes to planning space launches, the orbits of satellites, and circumnavigating the globe. The Space Shuttle orbiter takes approximately $90$ minutes to orbit or fly just beyond the Earth's diameter at a speed of \[27,880\]km per hour (\[17,322\]miles per hour). An orbiter spans roughly \[41,300\]km (\[26,000\]miles) in one orbit at an altitude of \[322\] km (\[200\]miles).