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#### Apparently incorrect answer in the Geometry Flash Cards Q-8

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 Post subject: Apparently incorrect answer in the Geometry Flash Cards Q-8  Posted: Fri Mar 02, 2012 3:58 am
 Students

Posts: 39
 Hi,I was going through the practice flash cards on geometry. I think that the answer to the data sufficiency question is wrong.I have attached the snapshot of the question here.

 Post subject: Re: Apparently incorrect answer in the Geometry Flash Cards Q-8  Posted: Sat Mar 17, 2012 11:40 pm
 ManhattanGMAT Staff

Posts: 2390
 LazyNK wrote:Hi,I was going through the practice flash cards on geometry. I think that the answer to the data sufficiency question is wrong.I have attached the snapshot of the question here.

 Post subject: Re: Apparently incorrect answer in the Geometry Flash Cards Q-8  Posted: Sun Mar 18, 2012 3:47 am
 Students

Posts: 39
 Hi Jamie,Thanks for your reply, but I'm sorry - I still don't agree. What I said was :The angle created by an arc at the circumference of the circle is half the angle created by that arc at the center.BUTIf the angle created by an arc at the circumference of the circle is half the angle created by that arc at any other point inside the circle , it doesn't imply that that point is the center of the circle.In short, if A implies B, then it can't be said surely that B implies A (unless the relationship is symmetric). I agree with you when you say that when O is the center of the given circle,

 Post subject: Re: Apparently incorrect answer in the Geometry Flash Cards Q-8  Posted: Tue Apr 17, 2012 6:54 pm
 ManhattanGMAT Staff

Posts: 4404
Location: Southwest Airlines, seat 21C
 Nishu, you are absolutely correct. The card is in error; you're right that the converse of the rule does not hold. I'll alert MGMAT to the error so it can be corrected when someone gets around to it.. _________________Tim SandersManhattan GMAT Instructor

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