0 1π is the ratio of the circumference to the diameter of a circle. Usually in Greek letters? Express delivery. ? = circumference/diameter? Inscribed regular polygon/diameter. When the side length of a regular polygon is longer, its circumference is closer to a circle. ? Hey? It was calculated by Zu Chongzhi, an ancient mathematician in China.

Pi is the ratio of the circumference to the diameter of a circle, which is generally written in Greek letters. Expressions are common mathematical constants in mathematics and physics. ? It is also equal to the ratio of the area of a circle to the square of its radius, which is the key value to accurately calculate the geometric shapes such as the circumference of a circle, the area of a circle and the volume of a ball. Under analysis? It can be strictly defined as the minimum positive real number x that satisfies sinx=0.

Pi in Greek letters? (pronounced p? I) is a constant (approximately equal to 3. 14 1592653), which is the ratio of circumference to diameter. It is an irrational number, that is, an infinite cycle decimal. In daily life, pi is usually expressed as 3. 14, which is used for approximate calculation. The fractional part 3. 14 1592653 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.

1965, British mathematician John? John wallis published a mathematical monograph, in which he deduced a formula and found that pi is equal to the product of infinite fractions. 20 15 scientists at the university of rochester found a formula with the same pi in the quantum mechanical calculation of hydrogen atomic energy level. On March 4th, 20 19, Google announced that pi has now reached 3 1.4 trillion digits after the decimal point.