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Showing the Pyramid Grand Gallery Projections to the Base.

All triangles have the ratio 2:1
FC = 2    GD = 1

KM is 2            LM is 1

DP is 2            KP is 1

DE is 2            LE is 1

KM is 2            KP is 1

AF = FH

The rectangle PKMN is 2:1

The horizontal line LR is 55.6861

The horizontal line CD is 55.6861

The height of the Grand Gallery perpendicular to the base is 27.843

                27.843 X 2 = 55.6861

The height to the Pyramid entrance floor is 55.6861