Open the computer Word document, create a new blank document, input Pinyin pai with keyboard with the help of input method, and select item 5. You can also click the expression icon of the computer's own input method, select the symbol icon, click the math icon, find the Uighur symbol, and click.

1 and π are irrational numbers, and their values are between 3. 14 15926 and 3. 14 15927.

2. 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 common 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 the smallest positive real number x satisfying sinx=0.

Pi is expressed in letters (pronounced pài) and is a constant (approximately equal to 3. 14 1592654), indicating 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 1592654 is enough for general calculation.