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17 Sep 2009, 08:23
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B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
65%
(hard)
Question Stats:
53% (01:53) correct
47%
(02:11)
wrong
based on 443
sessions
History
Date
Time
Result
Not Attempted Yet
In the figure to the right, if point C is the center of the circle and DB = 7, what is the length of DE?
(1) x = 60°
(2) DE || CA
Attachment:
triangle.jpg [ 10.43 KiB | Viewed 32049 times ]
04 May 2013, 10:56
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The correct answer is B.
Using similar triangles properties we can solve the question.
\(\frac{BC}{DB}=\frac{AC}{DE}\) \(\frac{3.5}{7}=\frac{3.5}{DE}\)
What you say (that A is sufficient) is not correct; you are assuming that DE || CA in your solution
Take a look at the picture, should be clear enough
BTW "we can use Tan": in GMAT you don't need trigonometry
Using similar triangles properties we can solve the question.
\(\frac{BC}{DB}=\frac{AC}{DE}\) \(\frac{3.5}{7}=\frac{3.5}{DE}\)
What you say (that A is sufficient) is not correct; you are assuming that DE || CA in your solution
Take a look at the picture, should be clear enough
BTW "we can use Tan": in GMAT you don't need trigonometry
Attachments
lengthoflinede.jpg [ 12.26 KiB | Viewed 28638 times ]
General Discussion
17 Sep 2009, 10:02
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I wud go with option B.
Line joining the midpoint and parallel to the third side will be half the length of the third side.So statement 2 states it is parallel to the third side.So DE = 7 cm.
I wud go with option B
Line joining the midpoint and parallel to the third side will be half the length of the third side.So statement 2 states it is parallel to the third side.So DE = 7 cm.
I wud go with option B
