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

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Senior Manager
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If A is the centre of the circle, what is the value of x ? [#permalink]

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20 May 2010, 01:54
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25% (01:03) correct 75% (00:42) wrong based on 2 sessions

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

(1) AD = BD = CD

(2) y = 60
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circlecircle.JPG [ 7.62 KiB | Viewed 1249 times ]

Senior Manager
Joined: 25 Jun 2009
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Kudos [?]: 127 [0], given: 6

Re: If A is the centre of the circle [#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
Affiliations: SPG
Joined: 15 Nov 2006
Posts: 327
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Kudos [?]: 749 [0], given: 28

Re: If A is the centre of the circle [#permalink]

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20 May 2010, 09:29
but the OA in my notes is A ...can someone help ???
Senior Manager
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Kudos [?]: 127 [0], given: 6

Re: If A is the centre of the circle [#permalink]

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20 May 2010, 09:59
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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untitled.JPG [ 10.94 KiB | Viewed 1195 times ]

Re: If A is the centre of the circle   [#permalink] 20 May 2010, 09:59
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