### Translation (US English)

**A Simple Tabletop Test for Flat Earth Claims**

Distances between cities are well established.
Take four cities (Moscow, Kazan, Saratov, Voronezh) and all six distances between them.

Scale them (1 cm = 100 km) and try to build one quadrilateral with both diagonals on a flat surface so all lengths match at once.

It doesn’t work.

Conclusion: the distances are not consistent with flat geometry → the surface is curved.

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### Summary

Real-world distances between cities cannot be perfectly reconstructed on a plane, which indicates Earth’s curvature.

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### Hashtags

**#FlatEarth #Science #Geodesy #EarthShape #Geometry #STEM #Experiment #CriticalThinking**