List of numbers – Irrational numbers ζ(3) – √2 – √3 – √5 – φ – α – e – π – δ Number System Evaluation of pi Binary 11.00100100001111110110… Decimal 3.1415926535897932384626433832795… Hexadecimal 3.243F6A8885A308D31319… Rational approximations 22⁄7, 223⁄71, 355⁄113, ...(listed in order of increasing accuracy) Continued fraction (Thi… (More on Pi)