2.2 What Is Pi?
In this chapter, we continue to explore computer science, problem solving, and the Python programming language by considering one of the most famous numbers of all: the number pi, often represented by the Greek letter π. Almost everyone has at one time or another used the value pi. In fact, we used π in the Introduction to Python chapter in our circle calculations.
Pi is defined to be the ratio of a circle’s circumference to its diameter (FIGURE 2.1). This relationship, π = C/d, gives rise to the familiar equation C = πd that is used to compute the circumference of a circle given the diameter. Because the diameter of a circle is twice the radius, this relation can also be written as C = 2πr, where r is the radius.
FIGURE ...
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