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Pyramid question

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  • 14-10-2006 1:11pm
    #1
    Victor
    Registered Users Posts: 78,404 ✭✭✭✭


    Can you solve the attached question? State what level you are at (higher, lower, year).

    Don't feel bad if you can't. Apparently its a difficult question.


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    #2
    Feral Mutant
    Registered Users Posts: 950 ✭✭✭Feral Mutant


    Gottit. First year in college.
    8*route13 or 28.844102
    Why is this on the CTYI forum?


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    #3
    mathias
    Closed Accounts Posts: 2,174 ✭✭✭mathias


    This is very basic ,

    Area of a triangle = 1/2 base x perpendicular height ,

    You already know the base is 4 , to get the height you use pythagoras for the right angle triangle in the centre ,

    Square of the hypotenuse = sum of squares on other two sides , so thats

    2 squared = 4 plus 3 squared = 9 = 13 , so hypotenuse = root 13 , this is the height of the triangle for a side.

    Area of one side = 2 x root 13 , so 4 sides = 8 x root 13


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    #4
    PurpleFistMixer
    Registered Users Posts: 5,851 ✭✭✭PurpleFistMixer


    Strange. I did it a slightly different way, I think. (I take this from the fact that your answer doesn't involve any roots of 17, and mine did.. : p)

    But yes, same answer, so must have worked out alright.

    And why shouldn't it be on the CTYI forum? : p It's not like the forum has any SPECIFIC purpose.


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    #5
    Victor
    Registered Users Posts: 78,404 ✭✭✭✭Victor


    I've put the answer here: http://www.boards.ie/vbulletin/showpost.php?p=52221922&postcount=15

    PFM, stop stalking me.


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    #6
    PurpleFistMixer
    Registered Users Posts: 5,851 ✭✭✭PurpleFistMixer


    ... No. I like pyramids.


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    #7
    Victor
    Registered Users Posts: 78,404 ✭✭✭✭Victor


    Fairy nuff.

    Same question.


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    #8
    Feral Mutant
    Registered Users Posts: 950 ✭✭✭Feral Mutant


    Not enough information given. There's no way to determine the inclination of the side of length 3.


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    #9
    Garret
    Closed Accounts Posts: 622 ✭✭✭Garret


    8 * route 13

    1st year college, i remember doin that question last year


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    #10
    Victor
    Registered Users Posts: 78,404 ✭✭✭✭Victor


    Feral Mutant wrote:
    Not enough information given. There's no way to determine the inclination of the side of length 3.
    Apologies. For a Feral Mutant you are very correct. Amended drawing attached.


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    #11
    PurpleFistMixer
    Registered Users Posts: 5,851 ✭✭✭PurpleFistMixer


    Alright, I got 62.25 but it's highly likely I made a calculatory mistake along the way. I think my theory is alright, though I didn't use the 1 at all.


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    #12
    Feral Mutant
    Registered Users Posts: 950 ✭✭✭Feral Mutant


    Victor wrote:
    Apologies. For a Feral Mutant you are very correct. Amended drawing attached.
    That's right. Everyone praise Daniel.
    I got 8*route13 again.


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    #13
    Victor
    Registered Users Posts: 78,404 ✭✭✭✭Victor


    Feral Mutant wrote:
    That's right. Everyone praise Daniel.
    I got 8*route13 again.
    Oddly enough, yes. I should really work these out before posing them. :D

    PFM: wrong! :shock:


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    #14
    Victor
    Registered Users Posts: 78,404 ✭✭✭✭Victor


    Next one. Lets move on slightly.


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    #15
    PurpleFistMixer
    Registered Users Posts: 5,851 ✭✭✭PurpleFistMixer


    Victor, where are you getting these from?


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    #16
    Victor
    Registered Users Posts: 78,404 ✭✭✭✭Victor


    Oh, I'm just inventing them as I go along.


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