Garfield, James (1831-1881)

James Abram Garfield was the 20th President of the United States of America. While not a mathematician he is included here because in 1876 while a Congressman he was credited with finding an original proof of the Pythagorean Theorem. The proof is interesting in that unlike many proofs his proof did not use the squares of sides of a triangle, instead it uses a pair of identical triangles of sides a, b, and c along with an isosceles triangle with legs of length c to create a trapezoid.

Links to my other sites that connect Garfield to
First Day Covers


Stamp Description
United States, 6c, 1926
Scott: 638 A161
United States, 20c, 1938
Scott: 825 A297