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C4 Ocr Past Paper question

Hi,
im a tad confused on question 8 (iii) and (iv)
https://983c9f06eb1f75af6e83364e092b06f1cb5c4277.googledrive.com/host/0B1ZiqBksUHNYZzd2VHZlOXdqZlE/January%202013%20MS%20-%20C4%20OCR.pdf

For 8 (ii) is it sufficient to find a value that i can multiply the direction vector of the equaition through a and the mid-point of BD that will give a vector equal to the position vector of C?

Thanks in advance.
(edited 7 years ago)
Reply 1
Avatar for Notnek
Notnek
21
Original post by SamuelN98
Hi,
im a tad confused on question 8 (iii) and (iv)
https://983c9f06eb1f75af6e83364e092b06f1cb5c4277.googledrive.com/host/0B1ZiqBksUHNYZzd2VHZlOXdqZlE/January%202013%20MS%20-%20C4%20OCR.pdf

For 8 (ii) is it sufficient to find a value that i can multiply the direction vector of the equaition through a and the mid-point of BD that will give a vector equal to the position vector of C?

http://www.ocr.org.uk/Images/144594-question-paper-unit-4724-01-core-mathematics-4.pdf

Do you mean (iii) instead of (ii)?

Your method sounds okay but you may want to post your working so we can check it.
Reply 2
Avatar for SamuelN98
SamuelN98
OP
5
Original post by notnek
http://www.ocr.org.uk/Images/144594-question-paper-unit-4724-01-core-mathematics-4.pdf

Do you mean (iii) instead of (ii)?

Your method sounds okay but you may want to post your working so we can check it.


yeah.IMG_0255.jpg
The image isnt the best quality but you should just be able to make out my workings if not ill post another.
Reply 3
Avatar for Notnek
Notnek
21
Original post by SamuelN98
yeah.IMG_0255.jpg
The image isnt the best quality but you should just be able to make out my workings if not ill post another.

That's fine.

Are you also stuck with 8iv? If you are, please post everything you've tried.
Reply 4
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SamuelN98
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5
Original post by notnek
That's fine.

Are you also stuck with 8iv? If you are, please post everything you've tried.


I am stuck, but honestly not sure where to start.
Reply 5
Avatar for Notnek
Notnek
21
Original post by SamuelN98
I am stuck, but honestly not sure where to start.

Ignore the coordinates and try to draw a 2-d sketch of ABCD using only the information given in parts (i), (ii) and (iii).

Please post a photo of this if you've done it and are still stuck.
Reply 6
Avatar for SamuelN98
SamuelN98
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5
Original post by notnek
Ignore the coordinates and try to draw a 2-d sketch of ABCD using only the information given in parts (i), (ii) and (iii).

Please post a photo of this if you've done it and are still stuck.


Is my diagram right? Thanks for the help btw
(I forgot to label C)
(edited 7 years ago)
IMG_0256.jpg270.5KB
Reply 7
Avatar for Notnek
Notnek
21
Original post by SamuelN98
Is my diagram right? Thanks for the help btw
(I forgot to label C)

Looks good.

So AB = AC from the question.

What can you say about BC and CD?

So...
Reply 8
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SamuelN98
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5
Original post by notnek
Looks good.

So AB = AC from the question.

What can you say about BC and CD?

So...


BC=CD
So a kite?
Reply 9
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Notnek
21
Original post by SamuelN98
BC=CD
So a kite?

That's correct.
Reply 10
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SamuelN98
OP
5
Original post by notnek
That's correct.


Thanks for the help!

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