Geometry Question

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

  1. Kjev

    Kjev Member

    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.

  2. johnflys2

    johnflys2 Member

    Dia. of circle

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

    If I'm wrong, somebody please correct me.

  3. dansls1

    dansls1 Member

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

    johnflys2 Member

    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

  5. blueeyedbear

    blueeyedbear Member

    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
  6. dansls1

    dansls1 Member

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

    paperbeam Member

  8. Kjev

    Kjev Member


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

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


    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

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

    TexasTubaMan Member


    to 14 places
  11. Millenniumfalsehood

    Millenniumfalsehood Active Member

    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

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

  13. paperbeam

    paperbeam Member


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


    What ya got?sign1


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

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