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# OCR MEI C4 Mathematics June 2016 - Official Thread watch

1. (Original post by MintyMilk)
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68.6 is average, but this was a harder than average paper. If I were you I'd be something like 85% sure that I'd get an A in C4
Thank you, i was just really thrown by the more challenging questions but i think that will reflect in the grade boundaries so i wasn't too worried. 65 for an A??
2. What was the decisive decision on the angle between the plane and the vector?? i got 56.04??
3. (Original post by Magicalgeofray)
What was the decisive decision on the angle between the plane and the vector?? i got 56.04??
you might be right or wrong, nobody knows for sure but alot of people have got that
4. (Original post by HFancy1997)
you might be right or wrong, nobody knows for sure but alot of people have got that
did anyone get forty something?!
5. To get the angle between the plane and the line, you needed to do 90 minus your theta if theta was acute, or theta minus 90 otherwise.
6. (Original post by Bunderwump)
To get the angle between the plane and the line, you needed to do 90 minus your theta if theta was acute, or theta minus 90 otherwise.
I wouldn't state that for fact. Many subtracted theta from 180.
Could be correct. We don't know.
7. (Original post by Bunderwump)
To get the angle between the plane and the line, you needed to do 90 minus your theta if theta was acute, or theta minus 90 otherwise.
Yes that's what I did and is the most logical imo, but theres alot of confusion so nobody is certain

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8. (Original post by 12284)
did anyone get forty something?!
Yes, basically I got what everyone got but took it off 90, so yes 43 something

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9. Finding the angle, which I will call x, by calculating the dot product and rearranging with the normal vector of the plane and the vector of the line produces the angle between the line and the normal to the plane. This means you have to make some adjustment to get the angle between the line and the plane.

Your calculation will have produced x as an acute or obtuse angle.

If x was obtuse, then you can see that the required angle + 90 = x, so required angle = x - 90.

If x was acute, you can see that x + required angle = 90, so required angle = 90 - x.

Doing 180 - x with an obtuse angle finds the acute angle between the line and the normal to the plane.
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10. (Original post by Bunderwump)
Finding the angle, which I will call x, by calculating the dot product and rearranging with the normal vector of the plane and the vector of the line produces the angle between the line and the normal to the plane. This means you have to make some adjustment to get the angle between the line and the plane.

Your calculation will have produced x as an acute or obtuse angle.

If x was obtuse, then you can see that the required angle + 90 = x, so required angle = x - 90.

If x was acute, you can see that x + required angle = 90, so required angle = 90 - x.

Doing 180 - x with an obtuse angle finds the acute angle between the line and the normal to the plane.
Absolutely correct.
11. Hi guys if anyone has any time could they post a solution to the question involving the constant of proportionality. Thank you.
12. How many ums is 68/90 ish
13. (Original post by Bunderwump)
Finding the angle, which I will call x, by calculating the dot product and rearranging with the normal vector of the plane and the vector of the line produces the angle between the line and the normal to the plane. This means you have to make some adjustment to get the angle between the line and the plane.

Your calculation will have produced x as an acute or obtuse angle.

If x was obtuse, then you can see that the required angle + 90 = x, so required angle = x - 90.

If x was acute, you can see that x + required angle = 90, so required angle = 90 - x.

Doing 180 - x with an obtuse angle finds the acute angle between the line and the normal to the plane.
Explained everything I was thinking
14. This debate about the angle of that question has gone on for too long for something worth 1/2 marks xD

Also, people still in agreement that it was a difficult paper (I didn't do any past papers so can't compare)??
15. (Original post by ComputerMaths97)
This debate about the angle of that question has gone on for too long for something worth 1/2 marks xD

Also, people still in agreement that it was a difficult paper (I didn't do any past papers so can't compare)??
Yeah one of the 'tricky' papers, basically they never spoonfed you on how to answer questions, but alot of show thats etc, but I think question 6 was kinda unfair to the majority as it had no guidance at all. Section B was really easy whilst section A was more tricky so id say around average. But comprehension was really easy too so id assume slightly above average grade boundaries

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16. I'm glad i'm not the only one think it was harder paper i was wondering wtf was going on the questions. Even people that did further math thinks it was hard in my school and on one of the question they had to use some things from further math to understand it. I think it was the last question. I just want to know what was MEI drinking at the time of making this tragic paper cos i want some of that. :^) But. the comprehension section was easy. I'm so glad they used normal language, unlike one of the past paper that takes about the sun and earth position.
17. Woah wait, you had to state the constant of proportionality???? great-.- lost one mark there oh welllll

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18. (Original post by HFancy1997)
Yeah one of the 'tricky' papers, basically they never spoonfed you on how to answer questions, but alot of show thats etc, but I think question 6 was kinda unfair to the majority as it had no guidance at all. Section B was really easy whilst section A was more tricky so id say around average. But comprehension was really easy too so id assume slightly above average grade boundaries

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I think I got 72/72 in c3, 16/18 on the coursework.
But really flunked c4 today.
Dropped about 16 marks on the first paper, then think I pulled it out the bag on the comprehension to salvage any scrap of hope for an A*
I think I'm looking about 70-74 in c4.
Any guess if that'll be high enough to average me out at an A* overally?
Just praying for an A* to be low 70s around 73 so I might stand a chance :/
19. (Original post by Danny_L)
I think I got 72/72 in c3, 16/18 on the coursework.
But really flunked c4 today.
Dropped about 16 marks on the first paper, then think I pulled it out the bag on the comprehension to salvage any scrap of hope for an A*
I think I'm looking about 70-74 in c4.
Any guess if that'll be high enough to average me out at an A* overally?
Just praying for an A* to be low 70s around 73 so I might stand a chance :/
I think you would just have got the A*, im assuming the grade boundries for c4 will be average. so 69/70. I think you'll either scrap and the A* or just miss it but its completely dependent on grade boundries now:/ im tending towards you getting the A* however bc dont think many people did well on c4 judging by the reaction the grade boundries will most likely be in your favour
20. (Original post by Danny_L)
I think I got 72/72 in c3, 16/18 on the coursework.
But really flunked c4 today.
Dropped about 16 marks on the first paper, then think I pulled it out the bag on the comprehension to salvage any scrap of hope for an A*
I think I'm looking about 70-74 in c4.
Any guess if that'll be high enough to average me out at an A* overally?
Just praying for an A* to be low 70s around 73 so I might stand a chance :/
In the exact same position as you haha

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