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Tesseract needs a geometry lesson...

Discussion in 'Channel Zero' started by imported_Tesseract, Oct 16, 2001.

  1. O.K. many of you still go to school and i am sure many just remember this stuff.
    I need to find the perimeter of a circle. i remember something like 2xpi(3,14)square.but i am not sure.
    You'll have to excuse my stupid english and try to understand what i mean...thanx
    Reward:a Tesseract drawing
  2. inkjunkie34

    inkjunkie34 Senior Member

    Joined: Jun 9, 2001 Messages: 1,614 Likes Received: 0
    i wonder if THE LAW knows his geometry...my four hours were completed!
  3. Smart

    Smart Dirty Dozen Crew

    Joined: Apr 14, 2000 Messages: 17,017 Likes Received: 178
    Pi(Radius squared) = area of a circle
  4. THE LAW

    THE LAW Guest

    it's been a long time since THE LAW calculated the circumference of a circle.

    try (2) times (pi) times (the radius of the circle).
  5. Poop Man Bob

    Poop Man Bob Dirty Dozen Crew

    Joined: Nov 16, 2000 Messages: 10,259 Likes Received: 18
    The circumference (perimeter) of a circle is:

    pi(radius*2) .... or .... pi(diameter)
  6. Smart

    Smart Dirty Dozen Crew

    Joined: Apr 14, 2000 Messages: 17,017 Likes Received: 178
    yeah, Poopman's got it...
  7. sectorTVA

    sectorTVA Senior Member

    Joined: Jul 8, 2000 Messages: 1,272 Likes Received: 1
  8. you guys sure that square of something is not involved?
  9. THE LAW

    THE LAW Guest

    if you are trying to compute the AREA of a circle, use smart's equation. That has a square.....perimeter/circumference does not.
  10. --zeSto--

    --zeSto-- Guest

    Here's the definitive math...

    diameter = 2 x radius of circle
    Circumference of Circle = PI x diameter = 2 PI x radius
    where PI = = 3.141592...

    Area of Circle:
    area = PI r2

    arc: a curved line that is part of the circumference of a circle
    chord: a line segment within a circle that touches 2 points on the circle.
    circumference: the distance around the circle.
    diameter: the longest distance from one end of a circle to the other.
    origin: the center of the circle
    pi (): A number, 3.141592..., equal to (the circumference) / (the diameter) of any circle.
    radius: distance from center of circle to any point on it.
    sector: is like a slice of pie (a circle wedge).
    tangent of circle: a line perpendicular to the radius that touches ONLY one point on the circle


    [b]I want that drawing[/b]
  11. Smart

    Smart Dirty Dozen Crew

    Joined: Apr 14, 2000 Messages: 17,017 Likes Received: 178
    but you CAN NOT do it Zesto's way, doubling Pi and multiplying but that leaves more opportunity for error, as you calculate Pi out to further decimal places, so if you're doing it for class, all 3 word but if you're building a tower, best to stick to the first 2 ways...

    and if all of this is gonna be on a test soon, be assured that they will almost always try to trick you on one question by supplying the diameter instead of the radius, be aware...
  12. --zeSto--

    --zeSto-- Guest

    hey smrt...
    "PI x diameter = 2 PI x radius"
    the above statement is correct.
    Sure PI*2 is too risky to calculate,
    but just try to prove it false... Dare Ya!

    oh... this is PI

    PI = 3. 1415926535 8979323846 2643383279 5028841971 6939937510 5820974944 5923078164 0628620899 8628034825 3421170679 ...

    Vieta's Formula
    2/PI = 2/2 * ( 2 + 2 )/2 * (2 + ( ( 2 + 2) ) )/2 * ...c

    Leibnitz's Formula
    PI/4 = 1/1 - 1/3 + 1/5 - 1/7 + ...

    Wallis Product
    PI/2 = 2/1 * 2/3 * 4/3 * 4/5 * 6/5 * 6/7 * ...
    2/PI = (1 - 1/22)(1 - 1/42)(1 - 1/62)...
  13. OK i tied it,
    This circle has a radius of 2cm
    applying the:
    PI x diameter = 2 PI x radius
    we have 6,28 x 2 = 8,28
    So the Circumference of this Circle is 8,28
    Right? seems ok with the eye.
    Thank you all for the help and the quick responce to this.
    Here's a frame from my Tesseract animation for you all:)
    Special thanx to Zesto and smart for the amount of info.
    Its not for a test (i finished school 6 years ago) either a building. Its for a canvas i'm working on.
    Since Zesto is the only one that showed interest on the prize plus he made his piece of info really simplified for my notknowing good english brain we wins it.Check your mail later on the day.
    Thanx to y'all again.
  14. bug

    bug Guest

    2pir for the circumference (perimeter)

    pir ^2 for the area.

    using differential calculus shows this relationship.

    that's also how you get volume of a sphere: (pir ^3)/3

    bug=math genius
  15. --zeSto--

    --zeSto-- Guest

    oh yeah bug...

    sphere = 4 pi r 2

    that's how you get surface area of said sphere

    and volume = (4/3) pi r 3 = what you said.

    we be so smart... s m r t ... d'oh