The origin of pi:
Archimedes of Greece (about 240 BC) was the first to get π≈3. 14, Ptolemy of Greece (about 150 BC) was the first to give the accurate value of the last four decimal places of π, Zu Chongzhi of China was the first to calculate the accurate value of the last seven decimal places of π, and Rudolph, a German mathematician from the Netherlands, was in1kl. In 1630, Griinberg uses Snell's improved method to calculate π value to 39 decimal places, which is the most important attempt to calculate π value by classical method.
Extended data properties:
Pi is the ratio of the circumference to the diameter of a circle, which is generally expressed by the Greek letter π and is a universal mathematical constant in mathematics and physics. π is also equal to the ratio of the area of a circle to the square of its radius. Accurate calculation of geometric shapes such as circle perimeter, circle area and sphere volume is the key value. In the analysis, π can be strictly defined as satisfying sinx? The smallest positive real number x = 0.
Pi in Greek letters? π (pronounced pài) is a constant (approximately equal to 3. 14 1592654), which is the ratio of circumference to diameter. It is an irrational number, that is, an infinite cycle decimal.
Usually 3. 14 is used to express pi for approximate calculation. The fractional part 3. 14 1592654 is enough for general calculation. Even if engineers or physicists want to make more accurate calculations, they only need to take the values to a few hundred decimal places at best.
Baidu encyclopedia -Pi