Cambridge Maths Academy

Archimedes (c.287 – c. 212 BC) $$ \begin{align} \frac{223}{71} < \pi < \frac{22}{7} \end{align} $$ $$ \begin{align} \pi \sim 3.14 \end{align} $$ Ptolemy (c.100 – c.170 AD) $$ \begin{align} \pi \sim 3.1416 \end{align} $$ Zu Chongzhi (430 - 501 AD) $$ \begin{align} \pi \sim \frac{355}{113} \quad (=3.1415929\cdots) \end{align} $$ Francois Viete (1540 - 1615) $$ \begin{align} \frac{2}{\pi} = \frac{ ..