More than a hundred years ago, long before anyone imagined supercomputers or black hole simulations, legendary Indian mathematician Srinivasa Ramanujan wrote down a set of formulas to calculate the ...

Pi, a mathematical constant denoted by the Greek letter π, is the ratio of a circle's circumference C to its diameter d: π = C/d. The circumference of a circle is, in turn, equal to 2πr, where r is ...