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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] New post 20 May 2010, 00:54
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A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

33% (01:03) correct 66% (00:12) wrong based on 3 sessions
If A is the centre of the circle, what is the value of x ?

(1) AD = BD = CD

(2) y = 60
Attachments

circlecircle.JPG
circlecircle.JPG [ 7.62 KiB | Viewed 860 times ]

Senior Manager
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Re: If A is the centre of the circle [#permalink] New post 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
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Re: If A is the centre of the circle [#permalink] New post 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] New post 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.
Attachments

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