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Edexcel IGCSE Mathematics A - Paper 3H - 2016 - Unofficial Mark Scheme

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Reply 280
Avatar for WhiteX
WhiteX
7
Original post by Martins1
They asked for it to the nearest whole number, you probably lost 1 mark only.

???
what about the AH angle and the plane efgh what was the angle 24.1 ??
Original post by Martins1
2 sides were 12 cm long, 2 were 8 cm long - the other side was not given. The angle between the 12 cm and 8 cm lines was 105 degrees


yes it was it was 13 for the bottom side
Reply 282
Avatar for WhiteX
WhiteX
7
Original post by maths1409
yes it was it was 13 for the bottom side


???
what about the AH angle and the plane efgh what was the angle 24.1 ??
Original post by 5566677
i added the original 24% opps.... i didn't do well on this paper


How many marks was this question?
Original post by WhiteX
???
what about the AH angle and the plane efgh what was the angle 24.1 ??


for the 3d trig question? i think i got 23.4 or 24.3 something like that
Guys
Why was the upper bound 4.75
Wouldn't it be 4.55 or something
Reply 286
Avatar for wertuv
wertuv
what was the gradient for the parallel question?
Reply 287
Avatar for WhiteX
WhiteX
7
Original post by maths1409
for the 3d trig question? i think i got 23.4 or 24.3 something like that


not it was the 10th or 19th i dont remember but i wrote 24.1

it was a big box shape
Original post by Authyris
I think you want to be looking at the volume of the sphere rather than the diameter for that question.

The answer for that question was 1637.
Upper bound of the side of the cube was 4.75 cm=47.5mm.
Lower bound of the radius of the sphere was 2.5mm.
Therefore the maximum number can be figured out by dividing the max volume of the cube by the minimum volume of the sphere.
1=Max volume cube = 47.5^3
2=Max volume sphere = 4/3 Pie R^3 = 4/3*pie*2.5^3
Divide 1 by 2 and you get 1637.465632.
However you cannot have 0.465632 of a sphere, so there are 1637 spheres which can be made from the cube.
Reply 289
Avatar for ZoeN2
ZoeN2
14
What were the answers to the fractions?
Original post by cornflakeexpert
Guys
Why was the upper bound 4.75
Wouldn't it be 4.55 or something


It said that 4.5cm was to the nearest 0.5 cm, not 0.1cm.
For the cube and sphere question

There has been a lot of debate as to whether the answer was 1439 or 1637

Here is the solution

4.5cm correct to the nearest 0.5cm
You can rewrite that as 45mm correct to the nearest 5mm
The upper bound of the length is therefore 47.5mm (not 45.5mm - that would be if it was to the nearest 0.1cm)

47.5^3 = 107171.875

The sphere has a radius of 3mm to the nearest mm so the lower bound is 2.5mm
The volume of the sphere is therefore 4/3pi x 2.5^3
=125/6 pi

Then you just divide 107171.875/125/6pi which gives you 1637.465...
Which gives you 1637
Original post by WhiteX
???
what about the AH angle and the plane efgh what was the angle 24.1 ??
Something like that, yeah. Cant really remember.
Original post by ZoeN2
What were the answers to the fractions?


You'd have to remind me which you are referring too.
Reply 294
Avatar for wertuv
wertuv
what was the gradient for the parallel question??
Original post by wertuv
what was the gradient for the parallel question?


3/4 if i remember correctly.
Reply 296
Avatar for wertuv
wertuv
Original post by Martins1
3/4 if i remember correctly.

oh god thanks i put the same but there are people who wrote 4 over 3
Reply 297
Avatar for 5566677
5566677
Original post by jyotikaur21
How many marks was this question?

urm 3 or 4 marks i think
Reply 298
Avatar for 5566677
5566677
for the trig question can anyone remember the sides of the triangle
How was it 51% for the Rupees question?? it said he gave 3/5 of his money to max... and then you had to work out the percentage in comparison to the original.

Bahrain got 3500.
Therefore he gives 3/5 away to Max.... 3/5=2100
Bhavin is left with 3500-2100= 1400
then the percentage out of original 6000 rupees = 1400/6000 x 100= 23%
(edited 7 years ago)

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