MathDB

11

Part of 1979 IMO Longlists

Problems(1)

Prove that the pyramid is regular

Source: IMO LongList 1979 - P11

5/29/2011
Prove that a pyramid A1A2…A2k+1SA_1A_2 \ldots A_{2k+1}S with equal lateral edges and equal space angles between adjacent lateral walls is regular.
geometry3D geometrypyramidgeometry unsolved