The phrase comes from a traditional Russian classroom rhyme that turns the Pythagorean theorem into an image of trousers equal on all sides, helping pupils remember the relationship between the sides of a right triangle. Generations of Russian-speaking students learned versions of the rhyme at school long before it circulated online. As a short meme audio clip, it now travels through reposts and edits detached from lessons, used mainly for its nostalgic recognition and its funny, chant-like delivery about maths.