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# GP3:Cricle Triangle

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Manager
Joined: 09 Oct 2008
Posts: 93

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21 Oct 2008, 18:37
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

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Senior Manager
Joined: 21 Apr 2008
Posts: 265
Location: Motortown

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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
Manager
Joined: 09 Oct 2008
Posts: 93

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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
Senior Manager
Joined: 21 Apr 2008
Posts: 265
Location: Motortown

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21 Oct 2008, 19:12
1
KUDOS
I was feeling lazy to type down the answer

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
Senior Manager
Joined: 04 Aug 2008
Posts: 369

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

yea its D
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VP
Joined: 30 Jun 2008
Posts: 1019

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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 ??
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VP
Joined: 30 Jun 2008
Posts: 1019

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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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# GP3:Cricle Triangle

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