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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. Ways to Remember the Meaning of Circumference, Radius, Diameter, and Chord [03/18/2004] If the minute hand touched the edge of the clock, would it be most like a diameter, radius, circumference, or chord of a circle? I have a hard time remembering what each of those means. What Are Differential Equations? [12/17/2003] Can you please tell me what differential equations are? Why do they have two variables? Why are the solutions formulas and not numbers? What are Flops? [02/25/2001] What are flops, as relating to computers? What Are Proofs? [08/12/1997] I am homeschooling and do not understand proofs. Can you help me out? What Are Quadratic Functions? [02/27/2003] What is the difference between a quadratic function and a quadratic formula? What Are the Definitions of Zero and Root? [12/23/2003] What is a zero, and what is a root? How are they used with regard to equations? Different sources seem to be giving me different answers, some of which contradict each other. What actually IS a root or zero? 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 N-gon? [06/01/1998] Can you explain the statement: "In an N-gon, n-3 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. Page: []

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