Section 3.2.1
In the Ancient Egypt for approx. 4500 years ago they had following lengths:
Lengths 
Metric system, meters 
1 Shet 
20.9440 
1 Cubit 
0.5236 
1 Remen 
0.3702 
1 Foot 
0.2618 
1 Hand* 
0.0740 
1 Finger 
0.0185 
Section 3.2.2
The correlation between the Ancient lengths are:
Shet 
Cubit 
Remen 
Foot 
Hand* 
Finger 
1 
40 
56 
80 
280 
1120 

1 
√2 or 1.4142 
2 
7 
28 


1 
√2 or 1.4142 
5 
20 



1 
3.5 
14 




1 
4 





1 
Please observe the different factors:
· 1 Khet = 100 Cubits
· 1 Shet = 40 Cubits
· 1 Cubit = √2 Remen, 1 Remen = √2 Foot
· 1 Cubit = 2 Foots
· 1 Cubit = 7 Hands*
· 1 Hand = 4 Fingers ( 2 x 2 )
· 1 Foot = 14 Fingers ( 7 x 2 )
· 1 Cubit = 28 Fingers ( 7 x 2 x 2 )
· 1 Shet = 56 Remens ( 7 x 2 x 2 x 2 )
· 1 Remen = 5 Hands*
* Some sources call the length "hand" for a "palm", it is exactly the same size. I prefer to use the word "hand".
Section 3.2.3
Square root of 2
Section 3.2.4
√2 is an irrational number, which has been known in thousands of years.
If a square measure 1 x 1, then the diagonal length (the hypotenuse) is √2.
Section 3.2.5
Other measures
Area:
1 Setat = 1 square Khet
Section 3.2.6
Pi:
Pi (π) is a mathematical constant defined as the ratio of the circumference of a circle to its diameter.
There is no evidence that the ancient Egyptians knew or used the irrational number Pi (=3.14159 or fractions like 22/7). They did not even need it, when they calculated the measures inside and outside the pyramid.
They used fractions in general as 1/x, x is ( x = 2,3,4,5 ...)  exception is the fraction 2/3.
Source: https://en.wikipedia.org/wiki/Ancient_Egyptian_mathematics
Section 3.2.7
Volume:
1 Hekat = 4,8 litres
1 Hin = 0,48 litres
Section 3.2.8
Angle or slope:
The ancient Egyptians did not calculate angles. They calculated the decrease or increase of steepness.
1 Seked = The horizontal length measured in hands / The vertically length measured in cubits.
The slope of the Khufu pyramid is 5 1/2 sekeds calculated as:
220 cubits horizontally x 7 hands/cubits / 280 cubits vertically = 5 1/2 sekeds.
There is a connection between a seked and an angle.
Imagine a right triangle with each side of 1 cubit as an example:
The horizontal is 1 cubit equal to 7 hands.
7 hands horizontal / 1 cubit vertical = 7 seked which is an angle of 45°
In general we can deduct following:
The cotangent to the angle is the adjacent side / the opposite side
then
if
then
or
and the angle A is: