Circular segment perimeter and area

Did you know ? Aristotle or Aristotelés was an ancient Greek philosopher and encyclopedic scientist (polyhistor), philosopher of antiquity, founder of logic and many other special branches of science (psychology, zoology, meteorology, etc.). Aristotle spent 20 years of his life in Plato's academy under Plato's guidance. In the Middle Ages, Aristotle was simply called "The Philosopher".