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# Gcse pastpaper question! watch

1. I found out p which is = 7.2 but what about Q?
I tried Pythagoras theorem, trapezium area, similarity. Got wrong answers.
Can someone tell me how to solve it ?
In the Mark scheme, Q is 6.4 ???

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2. (Original post by justwork)
...
Similiar triangles is the way to go.

What's your working when you've tried this method?
3. Anyone ?

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4. (Original post by justwork)
I found out p which is = 7.2 but what about Q?
I tried Pythagoras theorem, trapezium area, similarity. Got wrong answers.
Can someone tell me how to solve it ?
In the Mark scheme, Q is 6.4 ???

Posted from TSR Mobile
Did you remember to subtract 8 at the end (as it wants the value of q, not the side length).
5. Do you know how scale factors work?
6. (Original post by justwork)
I found out p which is = 7.2 but what about Q?
I tried Pythagoras theorem, trapezium area, similarity. Got wrong answers.
Can someone tell me how to solve it ?
In the Mark scheme, Q is 6.4 ???

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As has been said, similar triangles

Draw ABE and ACD out as separate triangles then use AE to find AD
7. (Original post by ghostwalker)
Similiar triangles is the way to go.

What's your working when you've tried this method?
So i should so 2 similar triangles ?1 big and 1 small ?

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8. Ok will do that

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9. I stopped here, a bit uncertain what should i do next ?

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10. (Original post by justwork)
I stopped here, a bit uncertain what should i do next ?
Oh dear

Look at the question
No right angles

The triangles are similar ... use your method from the first part
11. Just one more question about vectors, my main problem in that question was how should I start it ?
How can I find VW ?

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12. (Original post by TenOfThem)
Oh dear

Look at the question
No right angles

The triangles are similar ... use your method from the first part
Ok the facts are : just length similarity. So do you do 7.2/4 = 1.8
1.8 x 6.4= 11.52 ? Am I headed in the right direction ??

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13. (Original post by justwork)
Just one more question about vectors, my main problem in that question was how should I start it ?
How can I find VW ?
That is a very odd question but

a =

b =

and you need to combine those to give

VW =
14. (Original post by justwork)
Ok the facts are : just length similarity. So do you do 7.2/4 = 1.8
1.8 x 6.4= 11.52 ? Am I headed in the right direction ??

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No, where does 6.4 come from
15. But they are asking in terms of a and b ??

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16. (Original post by justwork)
But they are asking in terms of a and b ??

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I know

Are you seriously saying that you cannot see how to combine a and b to give that answer?
17. (Original post by TenOfThem)
No, where does 6.4 come from
If q is 11.52 how come in the mark scheme it was 6.4 for q ? This bit is abit puzzling to me ? Could it be that MS is wrong or we made a mistake ?

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18. (Original post by TenOfThem)
I know

Are you seriously saying that you cannot see how to combine a and b to give that answer?
I know how to do those, im just confused !!

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19. (Original post by justwork)
If q is 11.52 how come in the mark scheme it was 6.4 for q ? This bit is abit puzzling to me ? Could it be that MS is wrong or we made a mistake ?

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q is not 11.52

The MS is correct
20. (Original post by justwork)
I know how to do those, im just confused !!

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Look at the way have written the vectors

Look at a and b

You need to make out of them ... it is pretty easy

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