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project maths question LC ord 2010

  • 24-09-2011 11:53pm
    #1
    help_me1
    Registered Users Posts: 16 ✭


    Hi I am doing revision for my leaving cert and I was looking at question 9b in paper two for ordinary level maths 2010. Is there a misprint in this question a(ii) If = !AD! = !BD! , find !BC!. I cant see how they get the answer as they are taking about a parallelogram and from what I remember opposite sides in a parallelogram are equal. Any help would be great.


Comments

  • #2
    MathsManiac
    Registered Users, Registered Users 2 Posts: 1,595 ✭✭✭MathsManiac


    The marking schemes for Leaving Cert papers are available on the Exams Commission's website, and include solutions. The marking schem for this paper is here:
    http://www.examinations.ie/archive/markingschemes/2010/LC003GLP030EV.pdf

    See page 57.


  • #3
    help_me1
    Registered Users Posts: 16 ✭help_me1


    Hi yes, I looked at the solutions, but they introduce a point E which bisects the base DC its just not mentioned in the question??


  • #4
    whiteandlight
    Closed Accounts Posts: 2,359 ✭✭✭whiteandlight


    help_me1 wrote: »
    Hi yes, I looked at the solutions, but they introduce a point E which bisects the base DC its just not mentioned in the question??
    It's because of the statement they gave you. If those two sides are equal then bd=Bc (parallelogram). That makes the triangle bcd isosceles and a perpendicular dropped will bisect the bitten of it. On the iPhone switching between the PDF and safari so hope that clear, if not ask away and I'll see can I explain more


  • #5
    help_me1
    Registered Users Posts: 16 ✭help_me1


    Hi, no I get it now, thanks very much for your help


  • #6
    whiteandlight
    Closed Accounts Posts: 2,359 ✭✭✭whiteandlight


    Lol only realised now that the predict text corrected 'bottom' to 'bitten' oops!!


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