Welcome! Nice to see you here. Now.. Where's that kingking

easy one, tan=o/a cos=a/h sin=o/h, just remember it as toa cah soh

Hi, I want to join the facebook group where you all discuss about SPM. Please give me your facebook links. Thanks

This post has been edited by Greenfingers: Nov 26 2010, 01:14 PM

we discuss in skype lolx

[quote=Inspiralution,Nov 26 2010, 11:41 AM]
guys,how to do this?i got 38.xxx but answer given is D




It is 41.12. I got it. You have to cut the base BCD into half. Lets call mid point of BC as T. So it will form a triangle ATD. AD is 8cm and TD is root of 84cm. Then, tan ATD = 8/(root of 84). Hence solve.

bcause ∠ABD not right triangle? and how u find TD is root of 84cm ?

This post has been edited by ganick5461: Nov 26 2010, 01:31 PM

(10^2 - 4^2) = 84cm

Both ABD and ACD are right-angled triangles as A is vertically above D and BD=CD=10cm. This shows that base BDC is an isosceles triangle. Thus you need to cut BDC into half to form a right-angled triangle so that you can obtain length of TD. Using TD as adjacent side and AD as the opposite side, you'll be able to calculate angle ATD.

I apologize if this sounds complicated and confusing, I advise you to sketch the triangles for better understanding.

This post has been edited by henry930821: Nov 26 2010, 01:48 PM

Which mean BDC is an isosceles triangle, to find the angle between ABC and BDC, I need to cut BDC to make a right triangle?
the angle between ABC and BDC is not ABD, is ATD?

Yeap

[quote=henry930821,Nov 26 2010, 01:15 PM]
[quote=Inspiralution,Nov 26 2010, 11:41 AM]
guys,how to do this?i got 38.xxx but answer given is D


It is 41.12. I got it. You have to cut the base BCD into half. Lets call mid point of BC as T. So it will form a triangle ATD. AD is 8cm and TD is root of 84cm. Then, tan ATD = 8/(root of 84). Hence solve.

[/quote]
∠ABC is not a right angle? hmmm..this question is kinda tricky haha..

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Added on November 26, 2010, 2:28 pmanyone here has terengganu 2010 trial 's bio paper skema?

This post has been edited by 556611: Nov 26 2010, 02:28 PM

Nope ∠ABC is not a right angle. Since A is vertically above D, therefore ABC has to be an isosceles triangle as well since BDC is already an isosceles triangle as BD is equal to DC.

This post has been edited by henry930821: Nov 26 2010, 02:40 PM

hi.. i am new here.. er.. i was wondering if it's possible to get an A- for the sci subjects(chem,phy,bio) if i target around 60.. is it possible? thanks..

err i dun think so .... i think A+ nid at least 80

hmm base on the result i think , i think the best is to get 68 above ...

Lol bro he was asking about A-

add my into skype ya, id 'xdragonzer'

Added ! Welcome to the 4am crew

Opps ...
its possible 65 = A- ...

haha.. i see i see.. thanks.

LOL.. everyone studying now.. while im still lurking.. haven't study anything yet ... WTF!.. xD..
So, today must finish PAI.. tomorrow is addmath.. tomomorrow and tomorrow is physics.. tomorrow and tomorrow and tomorrow add math.. tomorrow and tomorrow and tomorrow and tomorrow maths + physics.. tomorrow and tomorrow and tomorroww LOL wtf!