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Author Topic: IGCSE MATHS DOUBTS HERE !!!!  (Read 39839 times)

Offline WARRIOR

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Re: IGCSE MATHS DOUBTS HERE !!!!
« Reply #30 on: September 17, 2010, 04:42:33 pm »
allright thanks ! i did the same thing but i thought there was another way to add the TANs rather than all of this mess

thanks

can anyone solve this question


The angle of elevation of the top of a tower is 38 from a point A due south of it. The angle of elevation of the top of the tower from another point B , due East  of the tower is 29.Find teh height of the tower if the distance AB is 50m

My drawing is attached and i got the asnwer  as 24.5 , while the right answer is 22.6

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elemis

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Re: IGCSE MATHS DOUBTS HERE !!!!
« Reply #31 on: September 17, 2010, 04:48:08 pm »
One minute.
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Offline WARRIOR

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Re: IGCSE MATHS DOUBTS HERE !!!!
« Reply #32 on: September 17, 2010, 04:48:36 pm »
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elemis

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Re: IGCSE MATHS DOUBTS HERE !!!!
« Reply #33 on: September 17, 2010, 05:00:12 pm »
Quote from: Kimo Jesus on September 17, 2010, 04:48:36 pm
:O

it was always 2 minutes !

Sorry dude, but I have to go out with my parents now.

Really sorry to leave you hanging, but I have to go now.
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Offline WARRIOR

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Re: IGCSE MATHS DOUBTS HERE !!!!
« Reply #34 on: September 17, 2010, 05:03:05 pm »
Quote from: Ari Ben Canaan on September 17, 2010, 05:00:12 pm
Sorry dude, but I have to go out with my parents now.

Really sorry to leave you hanging, but I have to go now.
kk no prob. Later then , have a good time.
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Offline WARRIOR

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Re: IGCSE MATHS DOUBTS HERE !!!!
« Reply #35 on: September 18, 2010, 06:30:31 am »
I also have another question .

When do we use 1/2.A.B.SIN C , and not 1/2 b x h
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elemis

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Re: IGCSE MATHS DOUBTS HERE !!!!
« Reply #36 on: September 18, 2010, 06:55:07 am »
Quote from: Kimo Jesus on September 18, 2010, 06:30:31 am
I also have another question .

When do we use 1/2.A.B.SIN C , and not 1/2 b x h

You generally use 0.5*b*h when its a right angle triangle.

The other one is used when you have the angle between two sides of a known length and the triangle ISNT right angled.
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Offline S.M.A.T

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Re: IGCSE MATHS DOUBTS HERE !!!!
« Reply #37 on: September 18, 2010, 08:10:44 am »
Quote from: Kimo Jesus on September 17, 2010, 04:42:33 pm
allright thanks ! i did the same thing but i thought there was another way to add the TANs rather than all of this mess

thanks

can anyone solve this question


The angle of elevation of the top of a tower is 38 from a point A due south of it. The angle of elevation of the top of the tower from another point B , due East  of the tower is 29.Find teh height of the tower if the distance AB is 50m

My drawing is attached and i got the asnwer  as 24.5 , while the right answer is 22.6



Your drawing confused me.'B' should be on the east of 'T' i.e TB should be perpendicular to TA

Here :)
« Last Edit: September 18, 2010, 08:19:28 am by asiftasfiq93 »
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Offline S.M.A.T

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Re: IGCSE MATHS DOUBTS HERE !!!!
« Reply #38 on: September 18, 2010, 08:24:43 am »
Quote from: Ari Ben Canaan on September 18, 2010, 06:55:07 am
You generally use 0.5*b*h when its a right angle triangle.
+
you can also use it in any triangle if you know the length of a side and the perpendicular of that side

Example below:

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Offline astarmathsandphysics

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Re: IGCSE MATHS DOUBTS HERE !!!!
« Reply #39 on: September 18, 2010, 08:43:40 am »
One mo
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Offline astarmathsandphysics

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Re: IGCSE MATHS DOUBTS HERE !!!!
« Reply #40 on: September 18, 2010, 08:47:28 am »
here for the projection question
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Offline WARRIOR

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Re: IGCSE MATHS DOUBTS HERE !!!!
« Reply #41 on: September 18, 2010, 08:49:51 am »
Thank you very very very very very very very  very very very very very very   very very very very very very  very very very very very very  
MUCH !!!!! i could have never solved it without you ! i had to draw a 3d diagram to understand  it ! thank you asiftasfiq93 very much for you time and effort !!!!!!!!!!!!!!!!!! By the way your hand writing is very readable , i didnt even have to zoom !

thanks a million man . + rep !!!!!!!!!!!!!!!!!


ps : thank you also sir ( astarmathsandphysics )  for your time and effort ! + rep to you too ! !
« Last Edit: September 18, 2010, 08:51:51 am by Kimo Jesus »
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Offline S.M.A.T

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Re: IGCSE MATHS DOUBTS HERE !!!!
« Reply #42 on: September 18, 2010, 10:17:55 am »
you welcome :D
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Offline WARRIOR

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Re: IGCSE MATHS DOUBTS HERE !!!!
« Reply #43 on: October 02, 2010, 02:28:10 pm »
A truck has a capacity of 10,000 litres
Amodel of the truck is made using a scale of 1:50
Calculate the capacity of the model in millilitres

 200?
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Offline Deadly_king

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Re: IGCSE MATHS DOUBTS HERE !!!!
« Reply #44 on: October 02, 2010, 03:32:30 pm »
Quote from: Kimo Jesus on October 02, 2010, 02:28:10 pm
A truck has a capacity of 10,000 litres
Amodel of the truck is made using a scale of 1:50
Calculate the capacity of the model in millilitres

 200?
This implies that 50 litres will be represented by 1
Therefore 10,000 litres will be represented by 1/500 * 10,000 = 200

But 200.......it's in terms of litres.

So you need to convert in terms of millilitres ---> 200 * 103( Ilitre = 103 ml)
Hence answer is 200,000ml.
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