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# How Is Pi Used in the Real World?

**Pi is an irrational number engineers use in many everyday tasks, including calibrating the speedometer of automobiles.** The wheels on a vehicle are circular, so the circumference of the tire, which is the distance it travels each rotation, is equal to pi times the diameter.

Pendulum clocks greatly improve the ability to keep time, according to About.com. The pendulum moves in the arc of a circle, with the arm of the pendulum equal to the diameter. Thus, pi figures into adjusting the clock for accuracy.

Statisticians use pi in solving questions concerning probability. The standard distribution, or bell curve, depends on pi as a constant.

The speed at which a professional baseball pitcher throws a ball depends on the length of his arm and pi. The joints in the arm are pivot points and the length of bone is the radius of a circle.

Pi is useful in calculations concerning waves. Thus, it finds use in light, sound and electronics. It is a part of many different types of entertainment from concerts to music files. It is a part of projectors as well as the screen on a computer. Pi is even involved in the creation of the rainbow, as well as a person's favorite color.

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## Is Pi Rational?

A: Pi is not a rational number. It is considered irrational. A rational number is able to be written as a fraction with integers for both the numerator and de... Full Answer >Filed Under: -
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## Why Does Pi Not Have Units?

A: Pi does not have units because it is a number, not a measurement. However, pi is sometimes treated like a unit when referring to angle measurements because... Full Answer >Filed Under: -
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## What Is Pi in Math?

A: Pi is a mathematical constant and irrational number representing the ratio of a circle's circumference to its diameter with a value of approximately 3.1416... Full Answer >Filed Under: -
Q:
## Is Pi a Rational Number?

A: Pi is an irrational number, so named because it cannot be expressed as the ratio of two integers. The decimal representation of an irrational number never ... Full Answer >Filed Under: