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    BIGBOPPER's Avatar
    BIGBOPPER Posts: 351, Reputation: 28
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    #1

    May 19, 2009, 09:13 PM
    What is the name of a solid triangle?
    I am trying to settle an argument here. Based on the old bible thing about the earth being a circle. Other poster contends that a square is three dimensional, and so is a triangle. I want to retort that a 3d square is called a cube, but want to see if there is a name for a 3d triangle. Any idea?
    nikosmom's Avatar
    nikosmom Posts: 1,611, Reputation: 488
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    #2

    May 19, 2009, 09:16 PM

    Tetrahedron.

    It has 4 sides all triangular (3 sides and bottom)
    Wondergirl's Avatar
    Wondergirl Posts: 39,354, Reputation: 5431
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    #3

    May 19, 2009, 09:18 PM

    A 3D circle is a sphere, by the way.
    Wondergirl's Avatar
    Wondergirl Posts: 39,354, Reputation: 5431
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    #4

    May 19, 2009, 09:20 PM

    A solid, 3D triangle is a pyramid.
    nikosmom's Avatar
    nikosmom Posts: 1,611, Reputation: 488
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    #5

    May 19, 2009, 09:23 PM
    Quote Originally Posted by Wondergirl View Post
    A solid, 3D triangle is a pyramid.
    A pyramid is 4 triangular sides and a square base.

    Guess the OP didn't clarify which he was looking for.
    BIGBOPPER's Avatar
    BIGBOPPER Posts: 351, Reputation: 28
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    #6

    May 19, 2009, 09:36 PM
    Quote Originally Posted by Wondergirl View Post
    A 3D circle is a sphere, btw.
    I told him that, and he claims, that there the circle is NOT a sphere. I hate ignorant people.
    Wondergirl's Avatar
    Wondergirl Posts: 39,354, Reputation: 5431
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    #7

    May 19, 2009, 09:45 PM
    Quote Originally Posted by BIGBOPPER View Post
    I told him that, and he claims, that there the circle is NOT a sphere. I hate ignorant people.
    A circle is flat, two-dimensional. A sphere is a ball, three-dimensional. He can Google it if he doesn't believe you.
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