Pi is one of the important constants in mathematics. It refers to the mathematical constant representing the ratio of the circumference and diameter of a circle, represented by the Greek letter π. π Is also equal to the ratio of the area of a circle to the square of the radius. The approximate value is approximately equal to 3.**. It is a key value for accurately calculating geometric shapes such as circle circumference, circle area, and spherical volume. It is the first special constant recognized by humans. In ancient China, there was a record of "three days per day". At that time, pi was considered to be a constant.
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