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Geometry

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Source: — Data Sufficiency |
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by 4meonly » Fri Nov 21, 2008 8:47 am
C looks very easy
where is the trick?
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by logitech » Fri Nov 21, 2008 8:56 am
4meonly wrote:C looks very easy
where is the trick?
what I love about this question is...IT LOOKS SIMPLE, just like a beautiful trap.

I would click C and move on if I saw this question in the first 10 questions of the quant.

But would I be that brave if it were 36th question of the test..I don't know!
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by rohangupta83 » Fri Nov 21, 2008 10:54 am
4meonly wrote:C looks very easy
where is the trick?
Well, C is not the OA :)
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by mals24 » Fri Nov 21, 2008 11:00 am
I can't seem to clearly figure out which angle is x: angle BCA or angle ACD?

If BCA = x, then answer should be A
If ACD = x answer should be C.
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by jimmiejaz » Fri Nov 21, 2008 11:03 am
In this question, unless we know any other value, the ans should be C.
But, as logitech said, if GMAT gives the question so straight, it wouldnt be called GMAT.
I would love to see the explanation for this one.
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by logitech » Fri Nov 21, 2008 11:19 am
Lets say BA were parallel to CD,

What would be the answer guys ?
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by mals24 » Fri Nov 21, 2008 11:20 am
Can someone please tell me what is x?
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by logitech » Fri Nov 21, 2008 11:22 am
mals24 wrote:Can someone please tell me what is x?
:D 90!!
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by mals24 » Fri Nov 21, 2008 11:24 am
@logitech

Btw if BA parallel to CD and BC parallel to DA, then the figure would be a parallelogram and the opposite angles would be equal.


And angle y and angle BCA would be equal. Actually even without BA being Parallel to CD, y=BCA.
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by mals24 » Fri Nov 21, 2008 11:27 am
I can't seem to clearly figure out which angle is x: angle BCA or angle ACD?

If BCA = x, then answer should be A
If ACD = x answer should be C.
I'm making a humble request to the users of this forum to please kindly enlighten me with the fact that what angle is x? From what I can see, and I don't doubt my eyesight, x seems to be on diagonal AC. So is x on AC's left or right.
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by rohangupta83 » Fri Nov 21, 2008 11:35 am
Sorry, I don't have a better diagram. This is what I saw when I attempted the question.

I assumed ACD = X and couldn't find a way to do it.

I guess ACD is not X but BCA is.
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by mals24 » Fri Nov 21, 2008 11:39 am
Whats the OA maybe that'll help us in figuring out what x is?
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by rohangupta83 » Fri Nov 21, 2008 1:03 pm
OA is A

so BCA should be the angle in question then.
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by mals24 » Fri Nov 21, 2008 1:10 pm
Since the answer is A then x = BCA = 50
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