Ask Dr. Math High School Archive

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 TOPICS This page:   conic sections,   circles    Search   Dr. Math Shortcuts:   why 360 degrees? See also the Dr. Math FAQ:   circle formulas and   segments of circles Internet Library:   conic sections,   circles 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 Conic Sections, Circles Stars indicate particularly interesting answers or good places to begin browsing. Selected answers to common questions:     About ellipses.     Find the center of a circle.     Is a circle a polygon?     Volume of a tank.     Why is a circle 360 degrees? Why Are There 2Pi Radians in a Circle? [11/24/2003] Why are there two pi radians in a circle? I know that it has something to do with the formula for the circumference of the circle, but I'm not sure how it works. Why Is a Circle 360 Degrees? [07/01/1998] Why is a circle defined as 360 degrees? Why is Area of a Circle Equal to Pi * (Radius Squared)? [07/05/2005] I know the formula for the area of a circle is A = pi*r^2, but why does that give the area? Why is Pi a Constant? [08/01/2000] Why is the circumference of a circle divided by the diameter, or pi, the same number for every circle? Why Pi? [07/19/2002] Instead of using pi, why don't we measure the radius and circumference of a given circle, and use that ratio to find the area? Wouldn't that be more accurate? Woodworking Curve [02/06/2002] I am making a cabinet and I want to put a curve on the front of the shelves. The "chord" of the circle would be 15" and a perpendicular line from the center point of the chord to the circumference of the circle is 1". Page: [

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