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GP3:Cricle Triangle

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GP3:Cricle Triangle [#permalink]

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New post 21 Oct 2008, 18:37
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Senior Manager
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Re: GP3:Cricle Triangle [#permalink]

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New post 21 Oct 2008, 18:59
D

It is easy to calculate when you know that AB = BO = OC
both will lead to the angle = 20 degrees

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Re: GP3:Cricle Triangle [#permalink]

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New post 21 Oct 2008, 19:04
OA is indeed D

LiveStronger can you tell mehow you have solve it?

I go for C..please let usknow how A is alone suffi.

OC and OB and OD are radius ..that much only I know :)

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Re: GP3:Cricle Triangle [#permalink]

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New post 21 Oct 2008, 19:12
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I was feeling lazy to type down the answer 8-)

There are 2 isosceles triangle here ABO and BCO
Lets say BAO = AOB = x
OBC = BCO = y
ABO = a
BOC = b

2x+a = 180
2y+b = 180
a+y = 180
--> 2x = y and 2x+2y+a+b = 360

1. x+b+60 = 180
x+b = 120
x+y+a+b = 300
from here you can deduce x = 20
2. y = 40
x = 20

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Re: GP3:Cricle Triangle [#permalink]

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New post 21 Oct 2008, 19:51
i said A without even lookin at 2 lol

had a long day...

yea its D
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Re: GP3:Cricle Triangle [#permalink]

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New post 22 Oct 2008, 01:57
LiveStronger wrote:
1. x+b+60 = 180
x+b = 120
x+y+a+b = 300
from here you can deduce x = 20


How did you get x+y+a+b = 300 ?? :stupid
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Re: GP3:Cricle Triangle [#permalink]

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New post 22 Oct 2008, 03:42
Get it now :) thanks
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Re: GP3:Cricle Triangle   [#permalink] 22 Oct 2008, 03:42
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