Problem #PRU-79399

Problems Methods Principio del casillero Principio del casillero (número finito de puntos, líneas, etc.) Geometría Geometría plana Polígonos Polígonos regulares Cuadriláteros Trapecios
 13–15  4.0

Problem

In a regular 1981-gon 64 vertices were marked. Prove that there exists a trapezium with vertices at the marked points.