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(HL) Perpendicular Distance Theorem

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  • 10-06-2007 2:12pm
    #1
    Lucas10101
    Closed Accounts Posts: 630 ✭✭✭


    I just read in the text and texts 5 book for the Perpendicular Distance proof and they give two combined methods. I personally think this is coming up/has a good chance and not sure do you have to know and write the two mothods for full marks or just one and write down the other as standard?


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    #2
    analyse this
    Closed Accounts Posts: 348 ✭✭analyse this


    The two methods make up the same proof


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    #3
    JC 2K3
    Closed Accounts Posts: 7,794 ✭✭✭JC 2K3


    The proof is using two methods of finding the area of a triangle and equating them.

    There's only one method of proving the theorum in the book.

    (Surely you can see that by reading it?)


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    #4
    Fobia
    Registered Users Posts: 1,958 ✭✭✭Fobia


    Aidan Roantree's Maths 1 book gives a different method of proving it actually. Involving using the Sine of an angle. It's alot shorter, and I presume it's just as valid, can't see any reason why it wouldn't be!

    I'll write it up later if anyone wants it who doesn't have the book.


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    #5
    Lucas10101
    Closed Accounts Posts: 630 ✭✭✭Lucas10101


    Yes, that would be good as it's way too long and annoying for me anyway. Thanks.


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    #6
    Fobia
    Registered Users Posts: 1,958 ✭✭✭Fobia


    Lucas10101 wrote:
    Yes, that would be good as it's way too long and annoying for me anyway. Thanks.

    Here you are.


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