Advertisement
If you have a new account but are having problems posting or verifying your account, please email us on hello@boards.ie for help. Thanks :)
Hello all! Please ensure that you are posting a new thread or question in the appropriate forum. The Feedback forum is overwhelmed with questions that are having to be moved elsewhere. If you need help to verify your account contact hello@boards.ie
Hi there,
There is an issue with role permissions that is being worked on at the moment.
If you are having trouble with access or permissions on regional forums please post here to get access: https://www.boards.ie/discussion/2058365403/you-do-not-have-permission-for-that#latest

project maths question LC ord 2010

  • 24-09-2011 10:53pm
    #1
    help_me1
    Registered Users, Registered Users 2 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, Registered Users 2 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, Registered Users 2 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!!


  • Advertisement
Advertisement