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A Pythagorean triple is a set of three positive whole numbers a, b, and c that are the side lengths of a right triangle.
Remark: there is no Pythagorean triple that approximates the angle of 51.84° of the Khufu (Cheops) Pyramid (see value for angle β). Taking the lenghts of 440 cubits and the height of 280 cubits we get proportions of a=22 to b=28 to c= 35.6 (or 111417.8). This corresponds to a seked of 5 1/2 palms.
Pythagorean triple  numbers added 
A multiple of 12? 
c² = b²
+ a² 
αβγ 

12knotrope  part of 60 

5 4 3  12  x 
x 
5² = 4² + 3² Angle of Khafre's pyramid 
36.8°53.1°90° 
10 8 6  24  x 
deduced from 5 4 3  36.8°53.1°90°  
13 12 5  30  x 
13² = 12² + 5²  22.6°67.4°90°  
15 12 9  36  x 
deduced from 5 4 3  36.8°53.1°90°  
17 15 8  30  x 
17² = 15² + 8²  28°62°90°  
20 12 16  48  x 
deduced from 5 4 3  36.8°53.1°90°  
25 24 7  56  25² = 24² + 7²  16.2°73.4°90°  
25 20 15  60  x 
x 
deduced from 5 4 3  36.8°53.1°90° 
26 24 10  60  x 
deduced from 13 12 5  22.6°67.4°90°  
29 21 20  60  x 
x 
29² = 21² + 20² Angle of Red pyramid 
43.6°'46.4°90° 
30 12 18  60  x 
x 
deduced from 5 4 3  36.8°53.1°90° 
34 30 16  80  deduced from 17 15 8  28°62°90°  
35 28 21  84  x 
deduced from 5 4 3  36.8°53.1°90°  
35.6 28 22  
Angle of Khufu's pyramid  35.6°51.8°90°  
36 28 23 45 35 28* 
87  Angle of Menkaure's pyramid  39.70°51.05°89.24° 

37 35 12  84  x 
37² = 35² + 12²  18.9°71.1°90°  
39 36 15  90  deduced from 13 12 5  22.6°67.4°90°  
40 32 24  96  x 
deduced from 5 4 3  36.8°53.1°90°  
41 40 9  90  41² = 40² + 9²  12.7°77.3°90°  
45 36 27  108  x 
deduced from 5 4 3  36.8°53.1°90°  
50 40 30  120  x 
deduced from 5 4 3  36.8°53.1°90°  
51 45 24  120  x 
deduced from 17 15 8  28°62°90°  
52 48 20  120  x 
deduced from 13 12 5  22.6°67.4°90°  
53 45 28  126  53² = 45² + 28²  31.8°58.1°90°  
55 44 33  132  x 
deduced from 5 4 3  36.8°53.1°90°  
60 48 36  144  x 
deduced from 5 4 3  36.8°53.1°90° 
* This seked is closer to the angle of 51.34° which was measured (28.1² + 35.1² = 45²) and also gives a right angle. Either this or the pyramid builders made some mistakes.
Wikipedia English:
Pythagorean triple (also called triplets)
The
Pythagorean theorem on www.mathepower.com
Credits:  Copyright 2006: 
Franz Löhner www.cheopspyramide.ch 
Concept and Design, Text: 
Teresa (Zubi) Zuberbühler www.starfish.ch 