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 TOPICS This page:   definitions    Search   Dr. Math See also the Internet Library:   dictionaries HIGH SCHOOL About Math Analysis Algebra    basic algebra    equations/graphs/      translations    linear algebra    linear equations    polynomials Calculus Complex Numbers Calculators/    Computers Definitions Discrete Math    permutations/    combinations Exponents    Logarithms Fibonacci Sequence/   Golden Ratio Fractals Functions Geometry    Euclidean/plane      conic sections/        circles      constructions      coordinate plane      triangles/polygons    higher-dimensional      polyhedra    non-Euclidean    practical geometry    symmetry/tessellations History/Biography Interest Logic Negative Numbers Number Theory Physics/Chemistry Probability Projects Puzzles Sequences/Series Sets Square/Cube Roots Statistics Transcendental   Numbers Trigonometry 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? Page: [

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