How is Wu (3. 14 15) calculated?

Wu (3. 14 15) was calculated by Zu Chongzhi, an ancient mathematician in China.

Zu Chongzhi, an ancient mathematician in China, approximated the circumference of a circle with the circumference inscribed by a regular polygon, thus obtaining the value of π accurate to the seventh decimal place.

π = perimeter/diameter ≈ inscribed regular polygon/diameter. When the side length of a regular polygon is longer, its circumference is closer to a circle. The π value calculated by Zu Chongzhi has been very accurate in most practical applications.

Pi is the ratio of the circumference to the diameter of a circle, which is generally expressed by the Greek letter π. 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. ?

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.

References:

Baidu encyclopedia -pi