William Jones, a mathematics teacher, first came up with pi; however, Leonard Euler is often credited with its introduction into mathematics. Jones wrote in his second book "Synopsis" that he believed pi was actually an ... More »

The quadratic formula as it is known today was published by Ren? Descartes in his book "La G?om?trie." However, he did not invent the quadratic formula by himself; simple versions of it have been used for thousands of ye... More »

The cell theory, which is comprised of three different but related elements, was discovered and developed by Matthias Schleiden, Theodor Schwann and Rudolph Virchow. All three men were scientists in Germany who lived dur... More »

A mathematics teacher named William Jones is credited with first using the symbol π in 1706 to represent the concept of the ratio between a circle's circumference and diameter. It had previously been ill-defined. More »

The square root of pi, like pi itself, is an irrational number. It can be approximated to four decimal places by 1.7725. The factorial of 1/2 is equal to half of the square root of pi. More »

The sine of pi is zero. In trigonometry, pi is known as the root or inflection point of the sine function. When expressed in radians, the sine of pi is equivalent to the sine of a 180-degree or 360-degree angle, both of ... More »

It is impossible to arrive at an exact value for pi because the digits that make up its decimal neither end nor repeat, according to Scientific American. It is therefore an irrational number, and the closest value that c... More »