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HARDEST MATH PAPER IN THE HISTORY OF IGCSE 0580 MATH 42 DISCUSSION

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Seems to be a lot of disagreement on the last answer :p

I'll put in my vote for n=20 (that's what I got)
 
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You multiply by 4. The arc AC has 2 triangles there: AOB and BOC. The angle MOB = 39, which makes up for a half of ONE OF THE TRIANGLES. Which means there are 3 other halves left to account for. Therefore the angle AOC = 39*4.

(360-39*4 = 204 ---- (204/360)*2(8.5)*pi = 30.264 = 30.3 (3 s.f.))

[That's what I got anyway]
well its wrong.
 
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You multiply by 4. The arc AC has 2 triangles there: AOB and BOC. The angle MOB = 39, which makes up for a half of ONE OF THE TRIANGLES. Which means there are 3 other halves left to account for. Therefore the angle AOC = 39*4.

(360-39*4 = 204 ---- (204/360)*2(8.5)*pi = 30.264 = 30.3 (3 s.f.))

[That's what I got anyway]

I follow the same procedure and got the same answer :)
 
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yeah it was 19 triangle i agree but here's the trick they asked for the point if u remember i don't know how to explain it but they werent asking for the number of triangle i am almost 100% sure it is 20
yes, when you subtract 1 from 20, you get 19 (the number of triangles where 19) as there was also a empty space left in the circle!
 
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yeps AC major arc was 360-78! and i bet u fell for it too XD
Listen that was major arc MN when they were extended to touch the circumfernce of circle...and sometimes you may have to admit that u're wrong...just go with it....:)..thats a sincere advice :)
 
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well u no wat at first i also did the same thing....bu while rechecking i realised they want the major AC not MN....so we had to multiply 39 by 4 and subtract it form 360.....and find the arc length.....this was the trap in this question and looks like you fell for it!!!:)
I did the same
 
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well u no wat at first i also did the same thing....bu while rechecking i realised they want the major AC not MN....so we had to multiply 39 by 4 and subtract it form 360.....and find the arc length.....this was the trap in this question and looks like you fell for it!!!:)
sorry but ur gonna lose 3 or whatever marks it was.
 
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