Garfield's Proof of the Pythagorean Theorem In Brief

Before he was US President (200 days in 1881), James Garfield was an instructor at and principal of the Eclectic Institute (1856-1860). Being well-trained in geometry and mathematics, he developed a proof of the Pythagorean Theorem. Amazing that, once upon a time, US Presidents -- Garfield, Jefferson, Lincoln, and more -- knew geometry extremely well!