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Browse High School Definitions
Stars indicate particularly interesting answers or
good places to begin browsing.
 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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