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Manhattan GMAT CAT- Length of Line DE

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by Misterbuff » Tue Sep 23, 2008 5:39 pm
Hi everyone,

Please see the attached problem. After reading the explanation Manhattan GMAT provided, I still believe I am correct. I would appreciate it if someone out there is able to provide a better explanation or maybe support my answer (D).

Thanks.
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Source: — Data Sufficiency |
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Re: Manhattan GMAT CAT- Length of Line DE

by parallel_chase » Tue Sep 23, 2008 6:27 pm
Misterbuff wrote:Hi everyone,

Please see the attached problem. After reading the explanation Manhattan GMAT provided, I still believe I am correct. I would appreciate it if someone out there is able to provide a better explanation or maybe support my answer (D).

Thanks.
I think the answer should be B.

Statement I

insufficient because it does not tell us anything about other angles.

Statement II

We can determine that both triangles are similar triangle.
therefore DE= 7

Whats the OA?
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by Misterbuff » Tue Sep 23, 2008 6:47 pm
Hmm, I just took another look at the problem and I now agree with the answer. Thanks for the help!
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Re: Manhattan GMAT CAT- Length of Line DE

by nitin86 » Wed Sep 24, 2008 10:05 am
parallel_chase wrote:
Misterbuff wrote:Hi everyone,

Please see the attached problem. After reading the explanation Manhattan GMAT provided, I still believe I am correct. I would appreciate it if someone out there is able to provide a better explanation or maybe support my answer (D).

Thanks.
I think the answer should be B.

Statement I

insufficient because it does not tell us anything about other angles.

Statement II

We can determine that both triangles are similar triangle.
therefore DE= 7

Whats the OA?
@paralle_chase,

Stmt 1 does tell us about the angle A and B. Because CA and CB are the radius of the circle, that mean CA = CB = r. And in triangle, ABC, angle C = x = 60, hence, angale A and angle B is also 60 degree.

Also, by same logic, triangle ABC becomes similar to triangle BDE
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Re: Manhattan GMAT CAT- Length of Line DE

by parallel_chase » Wed Sep 24, 2008 10:41 am
nitin86 wrote: @paralle_chase,

Stmt 1 does tell us about the angle A and B. Because CA and CB are the radius of the circle, that mean CA = CB = r. And in triangle, ABC, angle C = x = 60, hence, angale A and angle B is also 60 degree.
True
Also, by same logic, triangle ABC becomes similar to triangle BDE
False, you cant assume that DE = BE

We know that angle B is 60, but we dont know about angle D and angle E. Hence Insufficient.

Let me know if you think otherwise
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