Geometry Question

Discussion in 'Science Fiction & Fantasy' started by Kjev, Aug 13, 2007.

  1. Kjev

    Kjev Member

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    Does anyone know the formula to determine the perimeter of a circle?

    This would be so handy for designing things like Gun barrels, wheels, engines, and anyother cylinders.

    K'Jev
  2. johnflys2

    johnflys2 Member

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    Dia. of circle

    I believe the formula is 2 x pi x radius. ( pi = 3.14 )

    If I'm wrong, somebody please correct me.

    John
  3. dansls1

    dansls1 Member

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    The circumference is pi times the diameter (or pi times the radius times 2).
  4. johnflys2

    johnflys2 Member

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    I've posted this once but it didn't show, so here goes again.

    Thanks dansls1, that's a better way of saying it.
    Here is a site to speed up the math..............Circumference of a Circle

    John
  5. blueeyedbear

    blueeyedbear Member

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    Of the two equations given above, pi X diameter is the correct one for the circumference of a circle.

    And if you're interested, pi x (radius squared) = area of circle.


    pi = 3.1417
    Bob
  6. dansls1

    dansls1 Member

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    diameter = 2 x radius
    Therefore they are all correct ;)
  7. paperbeam

    paperbeam Member

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  8. Kjev

    Kjev Member

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    Ermmm.....

    Did I mention I posted this question since I SUCK at math?

    Now History, English, Spanish, or Arabic, that's a different story.

    K'Jev
    8)

    PS: NO WORD PROBLEMS! If God intended numbers to be mixed with letters, we'd be speaking Algebraic. They should stay in separate classrooms where they belong! :thumb:
  9. 72BMWR75/5

    72BMWR75/5 Member

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    Pie are round. Cornbread are square.
    Someone had to say it. ;)
  10. TexasTubaMan

    TexasTubaMan Member

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    3.14159265358979

    to 14 places
  11. Millenniumfalsehood

    Millenniumfalsehood Active Member

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    I know a guy who can name them off to the 200th place. Shall I give him a ring? :cool:
  12. Amazyah

    Amazyah Senior Member

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    Noooo, let's just have some of that cornbread!
    I hope it's sweet!:twisted:

    Russell
  13. paperbeam

    paperbeam Member

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    TexasTubaMan:

    I'm calling your 14 and raising it to 1,000...:twisted:

    1415926535897932384626433832795028841971693993751058209749445923078164062862089986280348253421170679821480865132823066470938446095505822317253594081284811174502841027019385211055596446229489549303819644288109756659334461284756482337867831652712019091456485669234603486104543266482133936072602491412737245870066063155881748815209209628292540917153643678925903600113305305488204665213841469519415116094330572703657595919530921861173819326117931051185480744623799627495673518857527248912279381830119491298336733624406566430860213949463952247371907021798609437027705392171762931767523846748184676694051320005681271452635608277857713427577896091736371787214684409012249534301465495853710507922796892589235420199561121290219608640344181598136297747713099605187072113499999983729780499510597317328160963185950244594553469083026425223082533446850352619311881710100031378387528865875332083814206171776691473035982534904287554687311595628638823537875937519577818577805321712268066130019278766111959092164201989

    What ya got?sign1

    Terry

    N and Z scale Old West paper models (free samples) at: paperbeam - virtual paper models