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Offline SauD~

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Maths
« on: April 30, 2011, 07:50:08 pm »
I wana remove the thread
« Last Edit: May 06, 2011, 09:35:17 pm by $~SauD~$ »
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Offline Vin

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Re: Maths
« Reply #1 on: April 30, 2011, 08:53:22 pm »
1. where's the rest of the question?

2. Its right. Just take -36cos A on the other side n get 72 on the right hand side.
36 cosA = 42 + 4.52 - 72

cos A = -12.75/ 36
A = 110.742

3.
T.SA = 2pi rh + pi r^2 + 2pi r^2
= (2pi x 3 x 12) + ( pi x 9) + ( 2pi x 9)
=99pi
= 311 cm2

(99pi / 8) * 0.09
= 3.4989
= $ 3.50

rest tom. because i gotta go to bed
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Offline SauD~

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Re: Maths
« Reply #2 on: April 30, 2011, 10:06:15 pm »
Quote from: Vin on April 30, 2011, 08:53:22 pm
1. where's the rest of the question?

2. Its right. Just take -36cos A on the other side n get 72 on the right hand side.
36 cosA = 42 + 4.52 - 72

cos A = -12.75/ 36
A = 110.742

3.
T.SA = 2pi rh + pi r^2 + 2pi r^2
= (2pi x 3 x 12) + ( pi x 9) + ( 2pi x 9)
=99pi
= 311 cm2

(99pi / 8) * 0.09
= 3.4989
= $ 3.50

rest tom. because i gotta go to bed
1.  i forgot 220 boys and 280 girls in the whole school...

2. Thanks :D

3. i wanted to know why we use the method you did or my teacher showed.. why not what i did ::)

Thanks and take you time..
Have a Good sleep :)
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