If A is the centre of the circle, what is the value of x ? : GMAT Data Sufficiency (DS)
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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, 00:54
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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 1217 times ]

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

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20 May 2010, 02:00
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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Re: If A is the centre of the circle [#permalink]

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20 May 2010, 08:29
but the OA in my notes is A ...can someone help ???
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Re: If A is the centre of the circle [#permalink]

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20 May 2010, 08:59
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 1163 times ]

Re: If A is the centre of the circle   [#permalink] 20 May 2010, 08:59
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