Mathematics: Post your doubts here!

[bluefa1con]

i need help in this question ..... EXPLANATION REQUIRED

Q In a polygon with n sides , half the interior angles are each 150 degree , and the other half are each 170 degree . calculate the value of n

ANSWER : 18

would be better if you post the paper and the question number

 

[anooshraja]

______________

lol omg i think i got just it now,, did you use volume = scale factor cube?

HOW WOULD WE KNOW IN SIMMILER QUESTION WHERE TO USE CUBE OR SQUARE?????????????????

 

[GlitteringLights]

any idea why he used doted line here?
from the link u posted
when i did this question i joined BD and my loci was a solid line
confused :/

i was confused about the dotted line too but the thing he drew seems correct,, if you would rotate it 90 degrees, it would lie on that point etc so i'm guessing it wont matter if it's dotted? though i would prefer doing a solid line
marking scheme says:
M1 arc through D radius BD
A1 some indication that the arc is from D to D′<<

 

[MERIHAN]

ITS JUNE 1999 Q 13 ..... i will try to find previous year past papers online ...

 

[GlitteringLights]

WHERE SORRY

it wont hurt scrollin' down

 

[anooshraja]

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Mathematics (0580)/0580_w07_qp_2.pdfQUESTION 21 http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Mathematics (0580)/0580_s11_qp_21.pdf
QUESTION 4 PART B ,5,

 

[bluefa1con]

i was confused about the dotted line too but the thing he drew seems correct,, if you would rotate it 90 degrees, it would lie on that point etc so i'm guessing it wont matter if it's dotted? though i would prefer doing a solid line
marking scheme says:
M1 arc through D radius BD
A1 some indication that the arc is from D to D′<<

yeah i checked marks scheme that why i was wondering

 

[GlitteringLights]

HOW WOULD WE KNOW IN SIMMILER QUESTION WHERE TO USE CUBE OR SQUARE?????????????????

if it's talkin bout area, you square
and if talkin bout voulume you cube

 

[MERIHAN]

would be better if you post the paper and the question number

ITS JUNE 1999 Q 13 ..... i will try to find previous year past papers online ...

 

[anooshraja]

if it's talkin bout area, you square
and if talkin bout voulume you cube

BT THERE IS ONE QUESTION WHERE THY DID NOT MENTION ANY THING IT'S
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Mathematics (0580)/0580_s11_qp_23.pdf QUESTION 17 PART B AND ONE MORE QUESTION 12

 

[anooshraja]

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Mathematics (0580)/0580_w07_qp_2.pdfQUESTION 21 http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Mathematics (0580)/0580_s11_qp_21.pdf
QUESTION 4 PART B ,5,

 

[bluefa1con]

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Mathematics (0580)/0580_w07_qp_2.pdfQUESTION 21 http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Mathematics (0580)/0580_s11_qp_21.pdf
QUESTION 4 PART B ,5,

i dont have summer 11 paper printed so i ll explain
since the base is same take the powers
p-5=1/2
p=5.5

question 5
24* 3600(seconds in 1 hour)=86400
part b is just standard form so 8.64 *10power4

 

[GlitteringLights]

yeah i checked marks scheme that why i was wondering

ahh i think maybe because if you drew a solid arc, it normally implies that it is the range/loci it can lie on however the point D' is the actual point it lies on for a 90 degrees rotation and not the whole arc, so a doted line is used. what do you think?

 

[GlitteringLights]

BT THERE IS ONE QUESTION WHERE THY DID NOT MENTION ANY THING IT'S
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Mathematics (0580)/0580_s11_qp_23.pdf QUESTION 17 PART B AND ONE MORE QUESTION 12

capacity is another word for volume, you also use logic
ques 12 of what year?

 

[bluefa1con]

ITS JUNE 1999 Q 13 ..... i will try to find previous year past papers online ...

check freexampapers i think they have compilation from 1990s to 2002
and post a screen shot

 

[bluefa1con]

ahh i think maybe because if you drew a solid arc, it normally implies that it is the range/loci it can lie on however the point D' is the actual point it lies on for a 90 degrees rotation and not the whole arc, so a doted line is used. what do you think?

i think we need to draw loci of the path from D to D', otherwise the question make no sense to me
since loci refers to points that lie on the given statements
i drew a solid line
does captain check this thread anymore? if so may be he can explain

 

[MERIHAN]

would be better if you post the paper and the question number

 

[bluefa1con]

View attachment 8546

you know that the sum of a interior angles of polygon is (n-2)*180
since the ratio of 150 angles to 170 angle is same we can be sure that if we multiply n/2 by their sum we will get the sum of internal angles

180(n-2) = (n/2)*(150+170)
180n-360 = 75n+85n
20n=360
n=18

 

[Razo513]

from where u got these question

may/june 2011 p21

 

[Zeerik]

Hey...anyone having there Exam Tomorrow!???