Pythagoras vs Bothaināyaṉār


Myself By T.V. Antony Raj


Pythagoras of Samos


In Euclidean geometry, the Pythagoras’ theorem (or Pythagorean theorem) is a relation among the three sides of a right triangle (or right-angled triangle). In terms of areas, it states:

In a right-angled triangle, the square of the hypotenuse (the side opposite the right angle) is equal to the sum of the squares of the other two sides.

Animated geometric proof of the Pythagoras the...
Click image to view an animated geometric proof of the Pythagoras theorem. (Photo credit: Wikipedia)

Pythagoras’ theorem can be written as an equation relating the lengths of the sides a, b and c:

where c represents the length of the hypotenuse, and a and b represent the lengths of the other two sides.

If the length of both a and b is known, then c can be calculated as follows:

If the length of hypotenuse c and any one side (a or b) are known, then the length of the other side can be calculated with the following equations:




The Pythagorean theorem is named after the Greek mathematician Pythagoras of Samos, an Ionian Greek philosopher, mathematician, and founder of the religious movement called Pythagoreanism whose central tenet was that numbers constitute the true nature of things.

Pythagoras is credited with the discovery and proof of the theorem. But it is often argued that the knowledge of the theorem predates him. Some claim that Babylonian mathematicians understood the equation, but there is not much of evidence for this claim.


Today, while surfing the internet I read a post in Facebook in Tamil and I was impressed by the following Tamil quatrain:

ஓடும் நீளம் தனை ஒரே எட்டுக்
கூறு ஆக்கி கூறிலே ஒன்றைத்
தள்ளி குன்றத்தில் பாதியாய்ச் சேர்த்தால்
வருவது கர்ணம் தானே.

oadum neelam thanai orae ettuk
kuru aakki koorilae ondraith
thalli kundraththil paathiyaaych cherthaal
varuvathu karnam thaanae

Divide the running length into eight equal parts. Discard one of the divided parts and add half the height. Isn’t the result the hypotenuse?

And here is another example:

a = 4
b = 3
So, c = (4 – 4/8) + (3/2) = 5

The article says that the author of this quatrain was a sage, mathematician, and poet named Bothaināyaṉār, and that the advantage of this Bothaināyaṉār‘s theorem over Pythagorean theorem is that the calculations can be easily done without calculating the square root.

By the way, this quatrain failed to produce the answer if a is less than b, for example if a = 3 and b = 4.

Next I tried the following:

Try #1: a = 12, b = 6

Modern mathematics:
sqr((12 x 12) + ( 6 x 6)) = 13.416407864998738178455042012388

Bothaināyaṉār’s method:
(12 – (12 / 8))  + (6 / 2) = 13.5

Try #2: a = 13, b = 9

Modern mathematics:
sqr((13 x 13) + (9 x 9)) = 15.811388300841896659994467722164

Bothaināyaṉār’s method:
(13 – (13 / 8)) + (9 / 2) = 15.875

Try #3: a = 15, b = 12

Modern mathematics:
sqr((15 x 15) + (12 x 12)) = 19.209372712298546059464653023865

Bothaināyaṉār’s method:
(15 – (15 / 8)) + (12 / 2) = 19.125

In most cases, the results obtained using Bothaināyaṉār‘s method was not accurate even to the first decimal place. So, I think I’ll better stick to the Pythagorean theorem.

Today, I spent a good amount of my valuable time on the net to learn about this person named Bothaināyaṉār, but was not able to gather any information about him. I doubt whether this person ever existed.

It’s funny that the Tamil word “Bothai” means inebriation and the word “nāyaṉār” translates to lord, master, or devotee. So, is someone playing a prank using the name Bothaināyaṉār (Devotee of Inebriation)?

The Tamil community and I would be glad if anyone out there could give any relevant and useful information on this subject. Your comments are welcome.


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10 thoughts on “Pythagoras vs Bothaināyaṉār”

  1. A blog is viral on WA with similar content and crediting Pothianar as the poet. It has no authenticity and contains mixing of facts and interpretations .

    It is well known fact , Indian Mathematician Bodhayana ( 800BC to 740BC ) was first to document this theorem. Well ahead of Pythagoras.

    Tamil poem is attributed to Bothayanar equating the Tamil version of Name Bhodhayana.

    When you write / read / write in Tamil script words from Sanskrita, undergo changes due to nature in the set of Alphabets in that language and versions of words gets produced ( for example : prabhakara becomes pirabaagaran;
    Charulata becomes saarulada;
    Tyagaraja becomes Diyaharaaja. Etc)

    Look at transition of word from Sanskrita in Tamil👇

    Bhodhayana ->Bodhayanar-> Bothayanar-> Pothayanar->pothaianar..

    This kind of word transformation happens in other Indian languages too ( Punjabi, Hindi, Bengali ).

    You can search for Pothianar or Botjiyanar ( as the author has concluded )
    any number of times ,you will not get result other than similar blogs with identical content

    Even the search for this poem lands to Bodhayanar or Bhodhayana .

    What needs to be appreciated, this Tamil poem gives approximate formula for Hypotenuse.

    Though the name of poem is unknown, the blogger has attributed to Bodhayana with Tamil version of Name to sound it authentic and equated in Sangama period to give credibility to his/ her research. ( this is how WA university research or internet based research creates fake narratives🤦‍♂)

    This approximation works only for few Right angle triangles only. Not generic like Bodhayana Sutra .

    I am no way dismissing the credit of this unknown poet of Tamil origin ( the approximate rule has to be appreciated) 🙏

    Bhodhayana has recorded exact theorem One can read his works Bodhayana sulabha sutra.


  2. I think his name was Bothaiyanaar.
    I agree that it might not be accurate at the decimal level but definitely creditable keeping in mind that this was long before pythagoras theorem when approximation was good enough and rounding was acceptable.
    There is always space for improvement and someone could prove pythagoras wrong one day or find something even more accurate. But it wouldnt take away what Pythagoras gave us.
    I think Bothaiyanar should be given credit for his work.

    Liked by 1 person

  3. Your observation that Baudhayana never existed is not right. Please refer to this link: “”.


    1. Krish,

      I have not mentioned anywhere in my article about Baudhayana or said that Baudhayana never existed. Anyway, thanks for your mentioning about Baudhayana and the link.


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