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Browse High School Definitions
Stars indicate particularly interesting answers or
good places to begin browsing.
 What Constitutes a Prism? [06/10/1999]

If I am looking at an object that's shaped like a triangle, how do I know
if it's a prism?
 What Does a Twofold Increase Mean? [01/23/2004]

Is a twofold increase simply twice the amount? What about a threefold
increase? I'm not used to this terminology of using 'fold.' Does it
refer to powers or multiples?
 What Does Average Mean? [12/05/2001]

Can someone explain what average is? For example what is the average
rainfall in New York? I understand the formula needed to find the
average, but what is the meaning of average?
 What Does a Vertical Bar Mean? [01/29/2001]

I want to know what the symbol  means, for example 2+3.
 What Does EE Stand For? [01/14/2003]

What does the EE stand for on a scientific calculator?
 What Does "Stellated" Mean? [03/31/1998]

Stellating polyhedra, including solids that are already stellated.
 What is a continued fraction? [03/06/1998]

What is a continued fraction and what makes it different from the types
of fractions or ratios I'm used to?
 What is a Cuboctahedron? [01/02/2001]

What is a cuboctahedron?
 What is a Functional Transformation? [08/11/2002]

I would like a brief definition of a functional transformation and
what an application is in early Calculus.
 What is a Median? [03/03/1998]

A definition of median, and four examples of calculating medians.
 What is an Ngon? [06/01/1998]

Can you explain the statement: "In an Ngon, n3 diagonals can be drawn
from one vertex"?
 What is a point? [8/26/1996]

Define a point, please.
 What is a Property? [11/29/2001]

I understand Undefined and Defined terms and Axioms and Theorems, but
what exactly is a Property? Is it the same thing as a Theorem? Also what
is a Law?
 What is a Set? [04/04/1997]

What is the correct term to refer to groups of objects like 3 cars, 7
pencils, or 5 apples?
 What is a Sign? [04/21/2003]

Can you do anything in math without signs?
 What is a slide rule? [07/27/1997]

What does a slide rule do and how does it work?
 What Is a Theorem and Why Are They Important? [08/15/1997]

I don't understand how theorems help us learn.
 What is Dimensional Analysis? [11/26/2001]

What is dimensional analysis and how does it work?
 What is Length in a Rectangle? [05/31/1999]

Is the length of a rectangle the longest side, whether vertical or
horizontal?
 What is Math? [10/04/1997]

Is math a science, an art, or some other anomaly?
 What is Meant by "the Sum of a Series"? [10/21/2003]

A series is the sum of consecutive terms. So why do many authors
speak about "the sum of a series" if the name "series" already means
"sum of consecutive terms"?
 What is the Definition of 'Number'? [01/26/2006]

I think of a number as a symbol for a measure of magnitude, like how
many of something there are. You can't have 2 + i things, so how can
that be a complex 'number'? How do you define what a number really is?
 What Motivates New Definitions? [02/06/2000]

Why do so many mathematical objects  groups, fields, rings, vector
spaces  have nearly identical definitions and properties? Does every
new object have to undergo some rigorous proof of its existence?
 What Skew Lines Are and Aren't [01/14/2004]

A description of skew lines including diagrams and definitions.
 When is the expression Q.E.D. used? [02/15/1999]

More on Q.E.D.
 Why Cubed? [11/27/2001]

Why do we use "cubed" for the volume of a figure?
 Why Does 0^0 = 1 and Not Undefined? [11/30/2007]

Your proof for why x^0 = 1 uses a law which breaks down at x = 0. Then
in your definition for 0^0 you side significantly in favor of 0^0 = 1
based on your rule for x^0 = 1 (which was based on a law that breaks
down at 0). Based on what I've read I would side in favor of
undefined. Are there any more conclusive reasons for siding with 0^0 = 1?
 Why Do We Have Leap Year ? [02/25/1998]

Why do we need to have one extra day each 4 years?
 Why Is a Circle 360 Degrees? [07/01/1998]

Why is a circle defined as 360 degrees?
 Why is a Telescoping Series Called Telescoping? [03/29/2008]

I understand what a telescoping series is, but I'm curious why it is
referred to as 'telescoping'. What's the reason for that name?
 Why is K Used as an Abbreviation for Area? [11/29/2004]

Many textbooks use the letter K to represent area in formulas, instead
of A. Do you know why that is?
 Why Isn't a Kilobyte 1,000 Bytes? [03/29/2001]

If the prefix kilo means 1000, why is a kilobyte 1024 bytes instead of
1000 bytes?
 Why Is Slope Rise Over Run and Not Run Over Rise? [03/05/2005]

We were wondering today in math class why slope is defined as rise
over run and why it couldn't be run over rise?
 Why They're Called Direction Cosines [09/11/2003]

I would like to know how to find the angles between a 3D vector and the
3 coordinate axes, given the components of the vector.
 Why Use Q and Z? [09/12/2001]

Why is the letter Q used for rational numbers and Z for integers?
 Writing Sigma Notation [02/03/1999]

What does the equation that goes under the Sigma notation imply?
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