Q:
# Why Does Pi Not Have Units?

**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 the actual unit, radians, is a length divided by length and is therefore dimensionless.

All "pure" numbers are defined as dimensionless quantities. These are the numbers that we use to count, including the irrational numbers like pi and e. Although some dimensionless quantities can have units (like radians), the units are only used when pure numbers are used to measure a quantity. Thus, it is possible to count to 100, but if discussing the length of a football field, it does not make any sense until a unit is added, for example, 100 yards.

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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: -
Q:
## What Is Pi?

A: Pi is the ratio of a circle's circumference to its diameter. The number pi, symbolized by a Greek letter, has a constant value that approximately equals 3.... Full Answer >Filed Under: -
Q:
## Why Is Pi Important in Math?

A: Pi is important in math because it describes how the circumference of a circle is in proportion to the diameter of a circle. To get pi, a mathematician div... Full Answer >Filed Under: -
Q:
## How Many Digits Are in Pi?

A: An endless number of digits are in pi. It is an irrational number, which means it cannot be expressed as the ratio of any two integers. Furthermore, it was... Full Answer >Filed Under: