Pi Day—an annual
celebration of the mathematical constant Pi—is observed on March 14.

Pi
is the ratio of the circumference of a circle to the diameter. For any size
circle, divide the circumference by the diameter and you always get same
number: 3.14 (with many subsequent digits).

Pi day not only offers us a great excuse to eat pie for breakfast, lunch
and dinner, but also a way to combat one of the most annoying
generalizations about PR professionals: *PR pros (and writers and editors) are bad at math*.

I wouldn’t say word nerds are bad at math; maybe it’s that they don’t like
math.

Yet, it’s still important to be math literate. PR pros should be able to do
more than just nod and smile politely when someone talks about compound
interest or exponential growth.

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So, on March 14, show up to the office with the best pie you can get your
hands on, and impress your colleagues with your knowledge of these math
terms.

(Definitions from math.com and mathwords.com).

**Accuracy**
**—**
how close a measured value is to the actual value

**Precision**
**—**
how close measured values are to each other

**Area**
**—**
the amount of space inside a two-dimensional object such as a triangle or
circle

**Circumference**
**—**
the distance around a circle

**Diameter**
**—**
a line passing through the center of a circle that connects two points on
the circumference

**Perimeter**
**—**
the distance around a two-dimensional shape

**Radius**
**—**
the distance from the center to the edge of a circle

**Pi **
**— the **
ratio of the circumference of a circle to the diameter

**Cardinal number**
**—**
numbers that indicate quantity, such as “one, two, three…”

**Ordinal number**
**—**
words that indicate order, such as “first, second, third…”

**Simple interest**
**—**
interest that is computed from only the original balance no matter how much
money has accrued so far

**Compound interest**
**—**
interest that is earned on the original balance and the interest already
accrued

**Average**
**—**
a central value of a set of numbers, calculated by adding up all the
numbers and dividing by how many numbers there are

**Mode**
**—**
a number that occurs most often in a list. 5 is the mode of 1,2,3,5,4,3,5,5

**Median**
**—**
the middle number in a series of numbers arranged in order of size; 88 is
the median of 72, 75, 88, 90, 97

**Range (statistics)**
**—**
in a series of numbers, the difference between the lowest and highest
values.

**Normal distribution**
**—**
when data is distributed in a “bell curve”

**Standard deviation**
**—**
the measure of how far data is from the mean. The more spread apart the
data, the higher the deviation

**Exponential growth**
—a model of growth in which the rate of growth is proportionate to the
amount present. This model is used for inflation and population growth

**Logistic growth**
—a model for a quantity that increases quickly at first and then slows as
it approaches an upper limit. This model is used to describe increasing use
of a new technology, spread of a disease, or saturation of a market

*PR Daily*
* *
readers, have any other math terms to add?

*
Laura Hale Brockway is a writer from Austin, Texas. Read more of her
posts on writing, editing, and corporate life on
*
PR Daily *and at *
*Impertinent Remarks**.*

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