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# C4 Ocr Past Paper question

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1. Hi,
im a tad confused on question 8 (iii) and (iv)
https://983c9f06eb1f75af6e83364e092b...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?

2. (Original post by SamuelN98)
Hi,
im a tad confused on question 8 (iii) and (iv)
https://983c9f06eb1f75af6e83364e092b...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-...hematics-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.
3. (Original post by notnek)
http://www.ocr.org.uk/Images/144594-...hematics-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.
The image isnt the best quality but you should just be able to make out my workings if not ill post another.
4. (Original post by SamuelN98)
yeah.
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.
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.
6. (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.
7. (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)
Attached Images

8. (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...
9. (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?
10. (Original post by SamuelN98)
BC=CD
So a kite?
That's correct.
11. (Original post by notnek)
That's correct.
Thanks for the help!

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