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vaivish: Master | Next Rank: 500 Posts; Posts: 371; Joined: Tue Apr 29, 2008 10:16 amFollowed by: 1 member; Thanked: 6 times

by vaivish » Wed Aug 27, 2008 11:21 am

127. Is quadrilateral ABCD a parallelogram?
(1) Area of triangle ABC is equal to area of triangle ACD.
(2) AD=DC

not sure about OA

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Source: Beat The GMAT — Data Sufficiency | Wed Aug 27, 2008 11:21 am

parallel_chase: Legendary Member; Posts: 1153; Joined: Wed Jun 20, 2007 6:21 amFollowed by: 2 members; Thanked: 146 times

by parallel_chase » Wed Aug 27, 2008 11:52 am

I think it should be E.

Statement I

area of both triangles are same.

Its better if you draw a figure without the two lines parallel. The figure could just be a quadilateral.

Therefore Insufficient.

Statement II

AD=DC
we dont know anything about the other two sides.

Therefore insufficient.

Combining I & II

If look at both the statements, they are saying almost the same things.

Therefore Insufficient.

Hence E is the answer.

Whats the OA?

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sethids: Master | Next Rank: 500 Posts; Posts: 135; Joined: Mon Jun 23, 2008 3:56 am; Thanked: 7 times

by sethids » Wed Aug 27, 2008 12:10 pm

I'll also go with E

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