Theory

3/ 6/ 9 and 3/5/7
Known as the 47th Problem of Euclid or Pythagorean theorem
Now if  Pythagoras and Euclid would have lived in the same room with Nikola Tesla imagine what they could have discovered and how the modern world could be much different than it is today.

ᴛʜᴇ ᴘʏᴛʜᴀɢᴏʀᴇᴀɴ ᴛʜᴇᴏʀᴇᴍ, ᴀʟꜱᴏ ᴋɴᴏᴡɴ ᴀꜱ ᴛʜᴇ
47ᴛʜ ᴘʀᴏʙʟᴇᴍ ᴏꜰ ᴇᴜᴄʟɪᴅ ᴏʀ  3:4:5:
ɪɴ ᴀɴʏ ʀɪɢʜᴛ ᴛʀɪᴀɴɢʟᴇ, ᴛʜᴇ ꜱᴜᴍ ᴏꜰ ᴛʜᴇ ꜱqᴜᴀʀᴇꜱ ᴏꜰ ᴛʜᴇ ᴛᴡᴏ ꜱɪᴅᴇꜱ ɪꜱ ᴇqᴜᴀʟ ᴛᴏ ᴛʜᴇ ꜱqᴜᴀʀᴇ ᴏꜰ ᴛʜᴇ ʜʏᴘᴏᴛᴇɴᴜꜱᴇ.
ᴛʜᴇ ʜʏᴘᴏᴛᴇɴᴜꜱᴇ ᴏꜰ ᴀ ʀɪɢʜᴛ ᴛʀɪᴀɴɢʟᴇ...ᴡʜɪᴄʜ ɪꜱ ᴛʜᴇ ʟᴏɴɢᴇꜱᴛ "ʟᴇɢ"...ᴏʀ ᴛʜᴇ 5 ꜱɪᴅᴇ ᴏꜰ ᴛʜᴇ 3:4:5
Add to this Nikola Tesla and his 3/ 6/ 9
Who knows maybe they could make text actually work here on FB
The square of 3 is 9.
The square of 4 is 16.  
The sum of 9 and 16 is 25.  (25 represents the hypotenuse).
The square root of 25 is 5.
Therefore, the ratio is written:  3:4:5:
https://youtu.be/6ZrO90AI0c8
The Pythagoras theorem equation is expressed as, c² = a² + b², where 'c' = hypotenuse of the right triangle and 'a' and 'b' are the other two legs.
So any triangle with one angle equal to 90 degrees produces a Pythagoras triangle and the Pythagoras equation can be applied in the triangle.