Poll: How was the C12 May/June 2017
Easy (10)
27.78%
Average (21)
58.33%
Hard (5)
13.89%
ramezamgad
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#1
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I wanted to post this thread to discuss the IAL C12 exam of May 2017 until the model answer is posted.

How did you find the exam? easy, average, hard??
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octoberrain
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Harder than others. I couldn't do the last part of the circle question where you had to find the equations of C2 and C3, and the last part of the last question...For some reason I kept getting the trig identity wrong until I gave up. Everything else should be fine though, I did most questions twice or three times.
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Julia_Kes
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The trick was finding the general equation (x-0)^2 (y-0)^2 = r^2Since both had the mid point (0,0)Then two points A and B were given and said to be on C1 and since C2 and C3 had to cross with C1 you could just put in the X and Y value of either A and B.If I am not mistaken.
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PearlDrummerSL
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It was hard .. does anyone has a model answer
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Hola1234
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#5
How was the exam
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mohammedbydoon
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would the grade boundaries be low?.?.?
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octoberrain
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(Original post by mohammedbydoon)
would the grade boundaries be low?.?.?
Hopefully, people are saying maybe 90-95/125. I really really hope so.
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ashwild69
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(Original post by mohammedbydoon)
would the grade boundaries be low?.?.?
The grade boundary depends on a lot of factors, but it's normally 92+, the only time it has been lower than that was during Jan papers, because the candidates doing the paper are mostly resitters.
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dk003
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The circles are concentric and they touch C1 so one is tangent externally and one internally.
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ebrahim4realz
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#10
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I got the first equation as (X)^2 - (Y)^2 = root 113the second circle C3 was (X)^2 - (Y)^2 = root 17circle C2 touches the circle outside and circle C3 encloses the entire circle C1 so I used the coordinates A for Circle C2 to get the radius and B to get the Radius for C3
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ramezamgad
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I have added the model answers for the exam here:

https://www.thestudentroom.co.uk/sho....php?t=4741260

I think the grade boundaries would be 100/125 for an A
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RunningScorpion
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(Original post by ebrahim4realz)
I got the first equation as (X)^2 - (Y)^2 = root 113the second circle C3 was (X)^2 - (Y)^2 = root 17circle C2 touches the circle outside and circle C3 encloses the entire circle C1 so I used the coordinates A for Circle C2 to get the radius and B to get the Radius for C3
How is it root 113 shouldn't it be root 13 and for c3 r^2= 117
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sarah99630
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how many marks was the question that was asking about the equations of the 2 circles?
and for the area that we were supposed to find using integration of the graph,was the answer 15.75? how many marks was that one too
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mohammedbydoon
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(Original post by sarah99630)
how many marks was the question that was asking about the equations of the 2 circles?
and for the area that we were supposed to find using integration of the graph,was the answer 15.75? how many marks was that one too
are was 51.75 and it had 6 marks , circle equations of c2,c3 had 4 marks .
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sarah99630
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(Original post by mohammedbydoon)
are was 51.75 and it had 6 marks , circle equations of c2,c3 had 4 marks .
aha! okay,thanks a lot!
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