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Browse High School Definitions

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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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