8C3 - 12 * 4C3 = 8
Any 3 vertices out of a rectangle only form a right triangles.
Then only 8 regular triangle left. (Cut out each of the 8 vertices)

On 2011-2-23 3:10, jalaj jaiswal wrote:
answer is 8 ,,, duno how

On Wed, Feb 23, 2011 at 12:31 AM, Sundi <[email protected] <mailto:[email protected]>> wrote:

    Is it not 8C3 = 56



    On Feb 22, 9:55 pm, jalaj jaiswal <[email protected]
    <mailto:[email protected]>> wrote:
    > Think of the 8 vertices of a given cube. You are allowed to join
    three
    > vertices to form a triangle. How many such unique acute
    triangles can you
    > make ??
    >
    > --
    > With Regards,
    > *Jalaj Jaiswal* (+919019947895)
    > Software developer, Cisco Systems
    > B.Tech IIIT ALLAHABAD

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--
With Regards,
*Jalaj Jaiswal* (+919019947895)
Software developer, Cisco Systems
B.Tech IIIT ALLAHABAD

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