The base was originally 108.5 meters or 355.8 feet square. Due to quarrying of the stone for other purposes, it is now 102.2 meters or 335.2 feet by 104.6 meters or 343.1 feet long and rises at an angle of 51º.

Dimensions: Width 108 m Length 108 m Height 66 m

And then some sites such as this one assume a rectangle and not a square which is a theory which I subscribe to.

base: 102.2 x 104.6 m
height: 66.45 m
slope: 51o 20' 25''
descending passage: 31.7 x 1.05 m (height: 1.2 m)
parelled chamber: 3.63 x 3.16 m
antechamber: 14.2 x 3.84 m (height: 4.87)
burial chamber: 6.59 x 2.62 m (height: 3.43 m)
length of causeway: 608 m

and here ...

The southernmost and last of the pyramids to be built was the Pyramid of Menkaure (Mycerinus), son of Khafre and the fifth king of the Fourth Dynasty. Each side measures 356 ft (109 m), and the structure's completed height was 218 ft (66 m).

and here ...

Main Pyramid
Original name: Menkaure is Divine
Date of construction: 4th dynasty
Original height: 66.45 meters
Angle of inclination: 51o 20'
Lengths of sides of base 104.6 meters
Length of Causeway 608 Meters

and from NOVA ...

Base: 344 feet (105 m) on each side

Total Weight: unknown

Average Weight of Individual Blocks of Stone: undetermined

Height: originally 215 feet (65.5 m), now 203 feet (62 m)

Angle of Incline: 51 degrees 20' 25"

and here ...

The Pyramid of Menkaure, located on the Giza Plateau in the southwestern outskirts of Cairo, Egypt, is the smallest of the three Pyramids of Giza. It was built to serve as the tomb of the fourth dynasty Egyptian Pharaoh Menkaure. Menkaure's Pyramid had an original height of 65.5 meters (218 feet). It now stands at 61 m (204 ft) tall with a base of 106 m (356.5 ft). Its angle of incline is approximately 51°20'25".

G1 is accepted at 440 and G2 seems to be content at about 411 so why is G3 so all over the board ?

Meanwhile we can return to your measurement of 1603.496 for our B-C line and when you said this ...

... I do agree (Petries station mark H line) is not an exact match with his point J on the wall system. It is 47.414 inches north of Petries J point corner most likely due to placing the station mark in the center of the corner and not on an edge. The walls are about 92 inches wide so 47 inches is about right for a center point. ...

So we have 1603.496 and then we have 47 inches [@ 20.Phi inches per cubit] or 2.28 cubits

Adding we get 1603.496 + 2.28 = 1605.78

So depending where on the wall we want to measure from we are somewhere between 1603.5 and 1605.8 with the mid point being 1604.65

NOW

When we take 64 Giza Grid distances we get 64 x 39.37 = 2519.68 if we use all four sides we get 2519.68 x 4 = 10078.72

If we want to find the corresponding circle we simply divide by Pi and then divide by two . This yields 10078.62 / Pi = 3208.16 dividing by two we get ... 1604.08 as our radius so the distance from B to C is the radius that circles the square of 64 units.

Observe ...



Love those ancient builders

Regards
Don Barone



"There is nothing as impenetrable as a closed mind"
and ..." if everything is a coincidence what is the point of studying or measuring or analyzing anything ?" db