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Mathematics: Post your doubts here!

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masterex567

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misscute406 said:
masterex567 Please explain the last one again yaar please!! Can't understand!!
Click to expand...

a hexagon is made of 6 equilateral triangles. if you get the area of 1 of these 6 equilateral triangles, you will find out that it is indeed equal to the shaded area of the whole triangle shown in the paper.
You had to assume that it was equal to 1/6 of these 6 equilateral triangles
 
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masterex567

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NOneed2speedd said:
Need help in these questions

1) may june 13 v.42 Q.4 (d), Q.9 (b) ii , Q.11 (d) iii
Click to expand...
question 4.
they are asking for MAJOR arc AC, which spans from A to C CLOCKWISE. Now if MOB is 39, OBN is also 39. Also AOM is 39 and ONC is 39. So angle AOC will be 360 - 4 * 39. Now calculate arc length using (360-4*39) as the angle.
9 b ii
now first of all the volume of the water in bucket which is 12 litre is responsible for the 5 mm height.
So we know volume of something is the cross sectional area * height.
Hence 12000 cm3 (converted from litres to cm3) = pi*r^2 * 0.5 (converted 5mm to cm). Use simple algebra to find r, as 87.4. Now it should be correct to nearest cm so answer is 87.

11 d iii
Now since these are similar triangles they have equal angles, and in previous part we calculated the angle as 18.4 degrees.
Now to make a whole circle of 360 degrees, we can find how many of these angles can be drawn to make 360 degrees by 360/18.4, which is 19.
Now one 18.4 degree angle makes 1 triangle, hence makes P1, P2, P3. etc. So similarly it will make "19" which we calculated triangles as (n-1) on diagram.
n-1 = 19 so n = 20.
 
misscute406

misscute406

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masterex567 said:
a hexagon is made of 6 equilateral triangles. if you get the area of 1 of these 6 equilateral triangles, you will find out that it is indeed equal to the shaded area of the whole triangle shown in the paper.
You had to assume that it was equal to 1/6 of these 6 equilateral triangles
Click to expand...
ooh thank you so much dude!!
 
NOneed2speedd

NOneed2speedd

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masterex567 said:
question 4.
they are asking for MAJOR arc AC, which spans from A to C CLOCKWISE. Now if MOB is 39, OBN is also 39. Also AOM is 39 and ONC is 39. So angle AOC will be 360 - 4 * 39. Now calculate arc length using (360-4*39) as the angle.
9 b ii
now first of all the volume of the water in bucket which is 12 litre is responsible for the 5 mm height.
So we know volume of something is the cross sectional area * height.
Hence 12000 cm3 (converted from litres to cm3) = pi*r^2 * 0.5 (converted 5mm to cm). Use simple algebra to find r, as 87.4. Now it should be correct to nearest cm so answer is 87.

11 d iii
Now since these are similar triangles they have equal angles, and in previous part we calculated the angle as 18.4 degrees.
Now to make a whole circle of 360 degrees, we can find how many of these angles can be drawn to make 360 degrees by 360/18.4, which is 19.
Now one 18.4 degree angle makes 1 triangle, hence makes P1, P2, P3. etc. So similarly it will make "19" which we calculated triangles as (n-1) on diagram.
n-1 = 19 so n = 20.
Click to expand...
Whoa! .. Thanks man... (y)
best of luck for ur exam...In Shah Allah we all will get A*;)
 
misscute406

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Guys I am not able to understand the mark scheme....0580/43/m/j/13 ques 3c(i) can someone send me the worked out answer please
 
loaie Amgad

loaie Amgad

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misscute406 said:
Guys I am not able to understand the mark scheme....0580/43/m/j/13 ques 3c(i) can someone send me the worked out answer please
Click to expand...
oh man its a graph
hhhhh take it as a rule m scheme cant help with graphs....
Just try to your furthest extent to be sure of your work.....
 
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masterex567

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What's the minimum mark required for grade column for? Like for paper 2 out of 70 it's 55 for example for A.
Does that mean if you get below 55 in that paper you can't get an A as final grade?
 
misscute406

misscute406

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masterex567 said:
What's the minimum mark required for grade column for? Like for paper 2 out of 70 it's 55 for example for A.
Does that mean if you get below 55 in that paper you can't get an A as final grade?
Click to expand...
I don't now but currently answer my prev question regarding Inequality please man!!
 
NOneed2speedd

NOneed2speedd

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masterex567 said:
What's the minimum mark required for grade column for? Like for paper 2 out of 70 it's 55 for example for A.
Does that mean if you get below 55 in that paper you can't get an A as final grade?
Click to expand...
Frm what I've heard u should get 88% out of 200 to get A* (as per 14 grade threshold)
now matter if u do bad in p.2 but good in p4 or vice versa. .
 
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