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# gmat prep geometry ds

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Manager
Joined: 01 Dec 2007
Posts: 52

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02 Sep 2008, 03:50
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correct is A

please tell me the approach to solve it.

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VP
Joined: 17 Jun 2008
Posts: 1474
Re: gmat prep geometry ds  [#permalink]

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02 Sep 2008, 03:54
Triangle BDC is an isosceles triangle with BD = BC.

Now, angle BDC = angle BAD + angle ABD. Thus, angle ABD is also x making ABD an isosceles triangle with AD = DB.

Now 1 says AD = 6 that means DB = BC = 6. Sufficient.

2 gives only the measure of angle and hence insufficient.
Director
Joined: 12 Jul 2008
Posts: 511
Schools: Wharton
Re: gmat prep geometry ds  [#permalink]

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02 Sep 2008, 04:10
blover wrote:

correct is A

please tell me the approach to solve it.

Angle ADB = 180 - Angle BDC = 180 - 2x
Angle ABD = 180 - (180 - 2x) - (x) = x --> Triangle ADB is an isosceles triangle with AD = DB = 6

Because Triangle BDC is also an isosceles triangle with DB = BC, BC = 6.

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.
Re: gmat prep geometry ds &nbs [#permalink] 02 Sep 2008, 04:10
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