Manhattan GMAT CAT- Length of Line DE

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.

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?

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.

Also, by same logic, triangle ABC becomes similar to triangle BDE