By unit of length and distance and conversion ,we can say that
Earth is of 6400 km radius .
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Earth's diameter is approximately 12,742 kilometers (7,918 miles) and its circumference is roughly 40,075 kilometers (24,901 miles) around the equator.
it is 25,285 miles at the equator
Approximately 12,742 kilometers. This distance is from the surface of the Earth to the center and then to the opposite side.
The Earth's equatorial circumference is approximately 40,075 kilometers.
Radiation from the Earth's core can travel up to several thousand kilometers to the surface. Radiation from the sun that reaches the Earth travels about 150 million kilometers.