**GEOMETRY IN THE GREAT PYRAMID**

The external dimensions of the pyramid, the dimensions of the inclined passages and the shafts, and the heights of the chambers and the horizontal passages in the vertical crossection of the pyramid are all derived from two geometric constructions. The first is a division of the half base of the pyramid into the golden section. The second is a division of the height of the pyramid by the square root of two

Draw line BC and construct the midpoint at D. Construct a perpendicular line from point D. Arc DB to point E. Construct the midpoint of CD at point F. Arc FE to point G. Arc CG to point A. Given a length of 440 cubits for BC, the length of AD is 280 cubits and the lengths of AB and AC are 356 cubits. Point G divides the half base (BD) into golden section segments of 84 cubits (BG) and 136 cubits (DG). Construct a perpendicular line from point G, arc GB to the line and construct horizontal line to point I. This is the height of the horizontal sections of the shafts in the king's chamber. Arc DG to point H, 136 cubits above the base of the pyramid. Extended to the southern face of the pyramid, the floor of the ascending passage and the grand gallery cuts the southern face of the pyramid 136 cubits above the base of the pyramid. The length of AH is 144 cubits.

Construct the midpoint of AB at C. Construct a perpendicular line from point C and arc CA to point D. Arc AD to point E. Given a length of 280 cubits for AB, AD and AE are198 cubits and BE is 82 cubits. 198 cubits is equal to the height of 280 cubits divided by the square root of two. The height of the floor of the king's chamber, the antechamber, and the horizontal passages connecting the grand gallery to the antechamber and the king's chamber is 82 cubits.

Construct a horizontal line through point A. Construct a circle with radius AB (198 cubits), intersecting the horizontal line at points C and D. Construct the midpoint of AC at point E. Construct the midpoint of AD at point F. Construct circle with radius CE, intersecting the horizontal line at point G. Construct circle with radius DF, intersecting the horizontal line at point H. Construct vertical lines at points E and F, intersecting the sloping faces of the pyramid triangle at points I and J. Construct circle with radius I J, intersecting the vertical line from point E at point K. Construct circle with radius J I, intersecting the vertical line from point F at point L. The horizontal distance between points I and J is 198 cubits. The height of I and J above the base of the pyramid is 154 cubits. Points I and J are the points that the king's chamber shafts exit the north and south faces of the pyramid. Points K and L are 198 cubits below points I and J, or 44 cubits below the base of the pyramid triangle.

AB, BC and CD are each 198 cubits long. Points E and F are located at the points where the king's chamber shafts exit the pyramid. EF and FP are each 198 cubits in length, producing an angle of 45

Point A is the previously constructed golden section segment on the half base of the pyramid, 136 cubits above the base. The midway point on vertical lines between the exit points of the king's chamber shafts and the upper ends of the queen's chamber shafts is also 136 cubits above ground level. Construct a horizontal line through point A, intersecting the southern face of the pyramid at point B. Construct a horizontal line through the exit points of the king's chamber shafts, 154 cubits above the base of the pyramid. Construct a vertical line through point B, intersecting the horizontal line from the king's chamber shaft exit points at point C and intersecting the base of the pyramid at point D. The length of CD is 154 cubits. Arc CD to point E and arc EC to point F. The length of CF is 308 cubits. Construct a vertical line from point F to the horizontal line through point A at point G. The length of BG is 308 cubits. This is the length of the ascending passage and the grand gallery as extended from the southern face of the pyramid to ground level. Arc BG to point H where it intersects of the base of the pyramid. BH crosses the midline of the pyramid 80.3 cubits above ground level. This is the height of the end of the floor of the grand gallery at the bottom of the great step at the midline of the pyramid. The angle of the ascending passage and the grand gallery that is produced by this construction is 26.20

The length of the floor of the grand gallery from the north wall to the great step at the midline of the pyramid is 88 cubits. The height of the horizontal sections of the queen's chamber shafts is 44 cubits. Point A is at the height of the horizontal sections of queen's chamber shafts. Arc AB to point C, 88 cubits above ground level on the midline of the pyramid. Construct a horizontal line from C and arc CB to point D. The floor of the grand gallery ends at the bottom of the great step at the midline of the pyramid at point E. Construct a horizontal line from point E and construct a vertical line from point D intersecting the horizontal line from point E at point F. Arc EF to point G on the previously constructed line of the floor of the grand gallery and the ascending passage. The ascending passage ends and the grand gallery begins at point G. The floor of the horizontal queen's chamber passage is also at the height of point G.

Point B is the previously constructed golden section segment on the half base of the pyramid, 136 cubits above the base. AB is 144 cubits. Construct a horizontal line from point A and arc AB to point C. Construct a vertical line from point C to the base of the pyramid at point D. Arc AD to the northern face of the pyramid. Point E is 32.4 cubits above the base of the pyramid. This is the height of the floor of the descending passage on the northern face of the pyramid. Construct a horizontal line from point E and a vertical line from point E to the base of the pyramid at point F. Construct circle EF and mark point G on the horizontal axis. Construct circle GE and mark point H on the horizontal axis. Construct a vertical line from point H to the base of the pyramid at point I. The slope of EI is one over two or 26.565