In a new peer-reviewed study, Ne'Kiya Jackson and Calcea Johnson outlined 10 ways to solve the Pythagorean theorem using trigonometry, including a proof they discovered in high school.

Two students who discovered a seemingly impossible proof to the Pythagorean theorem in 2022 have wowed the math community again with nine completely new solutions to the problem.

While still in high school, Ne’Kiya Jackson and Calcea Johnson from Louisiana used trigonometry to prove the 2,000-year-old Pythagorean theorem, which states that the sum of the squares of a right triangle’s two shorter sides are equal to the square of the triangle’s longest side (the hypotenuse). Mathematicians had long thought that using trigonometry to prove the theorem was unworkable, given that the fundamental formulas for trigonometry are based on the assumption that the theorem is true.

Jackson and Johnson came up with their “impossible” proof in answer to a bonus question in a school math contest. They presented their work at an American Mathematical Society meeting in 2023, but the proof hadn’t been thoroughly scrutinized at that point. Now, a new paper published Monday (Oct. 28) in the journal American Mathematical Monthlyshows their solution held up to peer review. Not only that, but the two students also outlined nine more proofs to the Pythagorean theorem using trigonometry.

  • gerbler@lemmy.world
    8·
    6 days ago

    Does this mean it’s going to henceforth be referred to as the Pythagorean Principle or something or does it still remain a theorem after proving.

    • joshthewaster@lemmy.world
      15·
      6 days ago

      A conjecture is a problem that is expected to be true but has not been proven. So it remains a theorem because it has already been proven. What they did is to prove it in a new way. New proofs could just be interesting or they could provide a new way to think about other un proven problems.

      • Tangentism@lemmy.ml
        7·
        6 days ago

        Jackson and Johnson are only the third and fourth people known to have proven the Pythagorean theorem using trigonometry and without resorting to circular reasoning. The two other people were professional mathematicians, according to the statement.

          • Tangentism@lemmy.ml
            4·
            6 days ago

            Not to downplay their achievement because not only are they joint third in proving it using trigonometry (without any circular logic) but they then put forward another bundle of proofs that smacks of them saying “it ain’t that hard!”

            I hope this is just the first time we hear their names like this!