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 TOPICS This page:   Euclidean/plane   geometry    Search   Dr. Math See also the Dr. Math FAQ:   geometric formulas Internet Library:   Euclidean/plane   geometry 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 Euclidean/Plane Geometry Stars indicate particularly interesting answers or good places to begin browsing. Selected answers to common questions:     Classifying quadrilaterals.     Pythagorean theorem proofs. 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 Geometry For? [03/01/2002] What is geometry really for? When Does 2D Become 3D? [01/20/2003] Is a piece of paper a 3D object when held up in space? Or is it a 2D object in 3D space? 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 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 Learn Geometric Proofs? [02/27/2002] Why are we taught geometric proofs if the vast majority of us will never use them? Why Proofs? Definitions and Axioms [09/16/2001] Why are proofs important in the development of a mathematical system like geometry? Why Was Pi Invented? [04/10/2003] What is pi good for? Wood Flooring [08/09/1997] Estimating the number of linear feet in 1 sq. ft., making wood flooring 3.25 inches wide, producing 5,000 sq. ft. per day. World War II Window Blackout [10/21/2001] Mr. Brown had a square window 120cm x 120cm, but the only material he could find was a sheet of plywood 160cm x 90cm; same area, different shape. He drew some lines and cut out just two congruent shapes, which he joined to make a square of the correct size. How did he do it? Writing a Proof [05/16/2001] Is there a certain way I should go about writing a proof? Yes, a Graph Can Touch an Asymptote [06/08/2006] Is it true that the graph of a function can never touch an asymptote? Zero Degree and 360 Degree Angles [10/22/2003] I am curious if there is such a thing as a zero degree angle, and if so, what does it look like? I am also wondering if a zero degree angle equals a 360 degree angle? I understand that a 360 degree angle is essentially a circle, or the amount of 'turn' that equals a circle. I am pondering how you would draw a 360 degree angle? Zooming Rectangles [05/11/2005] What is the math behind zooming rectangles? Page: [

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