Maths CIE 2013 oct/november Paper 21 help?!

[ryanfarooqi]

Asalam-O-Alaikum,

Today i gave the exam for maths p21 and i am having a doubt i did a question for a kite so the first question i think was Find the angle ABC so my answer was 41.955 and i was supoosed to multiply it by 2 bcuz it was the half angle so will my marks be deducted?

 

[snipex]

For statrters your answer is wrong bec the correct equation is(tan=6/8)

 

[yana.mmc]

No I believe it was 71.34 i think, can you tell me what you guys did in the hemisphere what was K??

 

[ryanfarooqi]

For statrters your answer is wrong bec the correct equation is(tan=6/8)

How can you explain me please

 

[snipex]

See, firs the length was 20cm divided in ratio 2:3, so first distance is (20x2/5=8) after that you have vertical length as 12 so divide it by 2 to get 6cm. After that(2xtan^-1x6/8 to get final answer 73.7

 

[ryanfarooqi]

See, firs the length was 20cm divided in ratio 2:3, so first distance is (20x2/5=8) after that you have vertical length as 12 so divide it by 2 to get 6cm. After that(2xtan^-1x6/8 to get final answer 73.7

Oh god i used 2:3 as 3:2=20:x
that makes my last answer wrong too? but i wrote the formula of the triangle with working two times for both halves of the triangles does that count?

 

[Al-Anoud]

See, firs the length was 20cm divided in ratio 2:3, so first distance is (20x2/5=8) after that you have vertical length as 12 so divide it by 2 to get 6cm. After that(2xtan^-1x6/8 to get final answer 73.7

^^Same here.

 

[.Luke.]

What was the correct area for the kite?

 

[joanna omar]

What was the correct area for the kite?

Its was 120 cm2

AND GUYS HOW ABOUT THE HeMisphere what was K ?

 

[joanna omar]

HOW about the train and the bridge question for the time ?

 

[joanna omar]

Remind what else was a bit challenging in he exam ?

^^Same here.

 

[ryanfarooqi]

weird i used the wrong values from the question 1 and then used them for the area of triangle and my answer came 120CM?!

 

[.Luke.]

HOW about the train and the bridge question for the time ?

I got 4.5 seconds?

 

[ryanfarooqi]

Its was 120 cm2

AND GUYS HOW ABOUT THE HeMisphere what was K ?

you had to take out the surface area to find the (r) and then use it for the volume

 

[ryanfarooqi]

I got 4.5 seconds?

i better not tell mine or i 'll suicide

 

[yana.mmc]

mine for the train was 2.5?? howw i minused 120-20 so i did 100'40

 

[yana.mmc]

100/40*

 

[.Luke.]

you had to take out the surface area to find the (r) and then use it for the volume

well that's what I did but then I think i got it wrong from there.. I wonder what the final answer is?

i better not tell mine or i 'll suicide

haha what was you're answer?

 

[yana.mmc]

you had to take out the surface area to find the (r) and then use it for the volume

did you use 3(pi)r^2 or 2(pi)r^2

 

[Al-Anoud]

Remind what else was a bit challenging in he exam ?

The last probablility question.