Reported as Caesar’s last words, spoken to Marcus Junius Brutus, as recorded in Divus Iulius by Suetonius, paragraph 82; this gave rise to William Shakespeare’s famous adaptation in Julius Caesar: “Et tu, Brute? — Then fall, Caesar!”
Pythagorean theorem (Wikipedia)In mathematics, the Pythagorean theorem or Pythagoras’ theorem is a fundamental relation in Euclidean geometry between the three sides of a right triangle. It states that the area of the square whose side is the hypotenuse (the side opposite the right angle) is equal to the sum of the areas of the squares on the other two sides.