Author Topic: IGCSE MATHS Doubts  (Read 129807 times)

Offline ivrytwr3

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Re: IGCSE MATHS Doubts
« Reply #735 on: May 15, 2010, 04:59:54 pm »
ok, an equilateral triangle has 3 sides all at 3cm; what is the height and how do you do it?!

Thank You!

Offline gold_wings

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Re: IGCSE MATHS Doubts
« Reply #736 on: May 15, 2010, 05:02:18 pm »
Half the triangle, the base will now be 1.5 cm and the hypotenuse will be 3.
Use Pythagoras' Theorem, your answer should be the square root of 3^2 - 1.5^2

Offline ankitd_1994

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Re: IGCSE MATHS Doubts
« Reply #737 on: May 15, 2010, 05:05:00 pm »
in May/June paper 4 2009 page 19 d(ii) part (its the last question in the paper) how do you get 1711 and 1770 I got 58 and 59 can someone please explain?
the terms would be the 58th and 59th, but the values would be 1711 and 1770 when u substitute the terms in the equation to find the nth term,
n(n+1)/2, so it will be (58*59)/2 and (59*60)/2 which is 1711 and 1770

Offline ivrytwr3

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Re: IGCSE MATHS Doubts
« Reply #738 on: May 15, 2010, 05:28:24 pm »
Half the triangle, the base will now be 1.5 cm and the hypotenuse will be 3.
Use Pythagoras' Theorem, your answer should be the square root of 3^2 - 1.5^2

thank you, that really helped.

Offline Shazizzzle

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Re: IGCSE MATHS Doubts
« Reply #739 on: May 16, 2010, 10:11:01 am »
« Last Edit: May 16, 2010, 10:18:19 am by Ari Ben Canaan »
•$#@2™•

Offline Baladya

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Re: IGCSE MATHS Doubts
« Reply #740 on: May 16, 2010, 10:15:25 am »
Looks like i ran out of cool signatures :|

Offline Vin

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Re: IGCSE MATHS Doubts
« Reply #741 on: May 16, 2010, 10:57:23 am »

tht gives the area of "rectangle" BCAE ( u visualise it by 'removing' tht part from the fig. )   

Offline Baladya

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Re: IGCSE MATHS Doubts
« Reply #742 on: May 16, 2010, 10:59:55 am »
tht gives the area of "rectangle" BCAE ( u visualise it by 'removing' tht part from the fig. )   

O ya so it becomes like a rectangle :D Thnanksss man :) Appreciated ;)
Looks like i ran out of cool signatures :|

Offline mdwael

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Re: IGCSE MATHS Doubts
« Reply #743 on: May 16, 2010, 11:14:14 am »
This is something frustrating neither my friends or I understand  ??? >:(
I always had problems in finding nth terms and sometimes I do but in paper O/N/07 page 10 question 9 (b) part I couldnt think of a way to find them, neither my friends. Can someone please tell us a solid guide or a way to do it there are 6 questions to find nth term in the Oct/Nov paper year 2007 question 9
We will really appreciate any help, thanks in advance :)
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Offline Vin

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Re: IGCSE MATHS Doubts
« Reply #744 on: May 16, 2010, 11:21:14 am »

Listen for nth term .. according to me is all trial and error .. u get it sometimes or u dont .. u hav to develop tht kind of thinking .. tht is by practice ..
u hav to try each and every method to get it .. i know a formula ..

dn + ( a - d )

d = Common difference  between all terms.
a = First term.

only works for numbers having a common diff.

see if this helps .. 

http://www.mathguide.com/lessons/SequenceArithmetic.html

someone had posted it .. i'd bookmarked it =P  (sorry if wasnt great help =| )

also ..

http://everything2.com/title/How+to+find+the+nth+term+of+a+number+sequence


Offline diva_sparkles

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Re: IGCSE MATHS Doubts
« Reply #745 on: May 16, 2010, 11:24:16 am »
This is something frustrating neither my friends or I understand  ??? >:(
I always had problems in finding nth terms and sometimes I do but in paper O/N/07 page 10 question 9 (b) part I couldnt think of a way to find them, neither my friends. Can someone please tell us a solid guide or a way to do it there are 6 questions to find nth term in the Oct/Nov paper year 2007 question 9
We will really appreciate any help, thanks in advance :)

my teacher solved sum pastpapers 4 us n this wz 1 of thm! so c if u can understnd 4rm tht n +rep if thts helpful!!
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Offline diva_sparkles

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Re: IGCSE MATHS Doubts
« Reply #746 on: May 16, 2010, 11:26:28 am »
Listen for nth term .. according to me is all trial and error .. u get it sometimes or u dont .. u hav to develop tht kind of thinking .. tht is by practice ..
u hav to try each and every method to get it .. i know a formula ..


ya actualy u cant use thm 4 all of thm
Don’t ask what the world needs. Ask what makes you come alive, and go do it. Because what the world needs is people who have come alive!!

Offline nanotaha

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Re: IGCSE MATHS Doubts
« Reply #747 on: May 16, 2010, 11:34:44 am »
Help! :(
Maths (IGCSE)
May June 2000
Q1.
(a) (i) (ii) (iii)
(b)

How do you find them?  :-\

Offline princess12

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Re: IGCSE MATHS Doubts
« Reply #748 on: May 16, 2010, 11:35:50 am »
u should start practcing from may 2003
We should be kind to after teachers

Offline nanotaha

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Re: IGCSE MATHS Doubts
« Reply #749 on: May 16, 2010, 11:38:09 am »
May 2003?
Why?