- 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.
- Alice Liddell (Wikipedia)
Alice Pleasance Hargreaves (née Liddell, /ˈlɪdəl/; 4 May 1852 – 16 November 1934) was an English woman who, in her childhood, was an acquaintance and photography subject of Lewis Carroll. One of the stories he told her during a boating trip became the classic 1865 children’s novel Alice’s Adventures in Wonderland. She shared her name with “Alice”, the story’s protagonist, but scholars disagree about the extent to which the character was based upon her.
- Pythagoras (Wikipedia)
Pythagoras of Samos (Ancient Greek: Πυθαγόρας; c. 570 – c. 495 BC) was an ancient Ionian Greek philosopher, polymath and the eponymous founder of Pythagoreanism. His political and religious teachings were well known in Magna Graecia and influenced the philosophies of Plato, Aristotle, and, through them, the West in general. Knowledge of his life is clouded by legend; modern scholars disagree regarding Pythagoras’s education and influences, but they do agree that, around 530 BC, he travelled to Croton in southern Italy, where he founded a school in which initiates were sworn to secrecy and lived a communal, ascetic lifestyle.
- Right triangle (Wikipedia)
A right triangle or right-angled triangle, sometimes called an orthogonal triangle or rectangular triangle, is a triangle in which two sides are perpendicular forming a right angle (1⁄4 turn or 90 degrees).
