# Surveyors

Surveyors mark 4 points on the surface of the globe so that their distances are the same. What is their distance from each other?

x =  10403.7994 km
d =  12580.2699 km

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Theme - problem of a tetrahedron  (4 vertices). The sphere  - circumsphere (Earth) is described by this tetrahedron and we are looking from its radius to the side length. From formula. Tips to related online calculators
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