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# If A is the centre of the circle, what is the value of x ?

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Senior Manager
Affiliations: SPG
Joined: 15 Nov 2006
Posts: 298
If A is the centre of the circle, what is the value of x ?  [#permalink]

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20 May 2010, 01:54
00:00

Difficulty:

95% (hard)

Question Stats:

32% (02:11) correct 68% (01:55) wrong based on 45 sessions

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circlecircle.JPG [ 7.62 KiB | Viewed 1709 times ]

If A is the centre of the circle, what is the value of x ?

(1) AD = BD = CD

(2) y = 60
Senior Manager
Joined: 25 Jun 2009
Posts: 272
Re: If A is the centre of the circle, what is the value of x ?  [#permalink]

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20 May 2010, 03:00
dimitri92 wrote:
If A is the centre of the circle, what is the value of x ?

(1) AD = BD = CD

(2) y = 60

D,

St 1 - AD = BD=CD means triangle ABD is an equilateral triangle and hence all the angles are equal to 60 there fore x = 30

St 2 - AB = AD = radius of the circle, hence angle ADB = ABD = y = 60

hence x= 30
Senior Manager
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Joined: 15 Nov 2006
Posts: 298
Re: If A is the centre of the circle, what is the value of x ?  [#permalink]

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20 May 2010, 09:29
but the OA in my notes is A ...can someone help ???
Senior Manager
Joined: 25 Jun 2009
Posts: 272
Re: If A is the centre of the circle, what is the value of x ?  [#permalink]

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20 May 2010, 09:59
1
dimitri92 wrote:
but the OA in my notes is A ...can someone help ???

I guess you are right mate, I thought again and then realized that I got carried away with the figure which is provided, have a look at the figure which I am attaching,

That will explain, why B is not sufficient.
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Posts: 11011
Re: If A is the centre of the circle, what is the value of x ?  [#permalink]

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09 Sep 2017, 21:57
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Re: If A is the centre of the circle, what is the value of x ?   [#permalink] 09 Sep 2017, 21:57
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# If A is the centre of the circle, what is the value of x ?

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