Final answer:
The Earth's radius is approximately 6,371 km, which is the accepted average distance from its surface to the center.
Step-by-step explanation:
The approximate radius of the Earth, which is the distance from the surface to the center, is about 6,371 kilometers (km).
This measurement varies slightly depending on where it is measured from, for instance, from the center to the pole, or from the center to the equator due to the Earth's slightly oblate shape.
However, for most calculations, especially those concerning objects close to the Earth's surface, we can consider the average radius to be about 6,370 kilometers or 6371 km as per the given reference.