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Comparison AB or BC

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Comparison AB or BC [#permalink] New post   09 Dec 2018, 13:02
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#GREpracticequestion Comparison AB or BC.jpg [ 9.53 KiB | Viewed 9567 times ]


Quantity A
Quantity B
AB
BC


A. The quantity in Column A is greater
B. The quantity in Column B is greater
C. The two quantities are equal
D. The relationship cannot be determined from the information given
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D
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Re: Comparison AB or BC [#permalink] New post   10 Dec 2018, 07:47
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Carcass wrote:
Attachment:
#GREpracticequestion Comparison AB or BC.jpg


Quantity A
Quantity B
AB
BC


A. The quantity in Column A is greater
B. The quantity in Column B is greater
C. The two quantities are equal
D. The relationship cannot be determined from the information given


Let's examine some possible case

Case i: It could be the case that ∆ADC is an isosceles triangle, which means ∆ADB and ∆CDB IDENTICAL triangles.
Image
In this case, Quantity A EQUALS Quantity B



Case ii: It could be the case that ∆ADC is NOT an isosceles triangle, and we have something like this:
Image
In this case, Quantity B is GREATER THAN Quantity A


Answer: D

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Re: Comparison AB or BC [#permalink] New post   16 Dec 2018, 03:25
Cannot we use the property that when two angles are equal , the sides opposite to the two angles will also be equal and hence in this case AB will always be equal to BC
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Re: Comparison AB or BC [#permalink] New post   16 Dec 2018, 04:27
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kunalkmr62 wrote:
Cannot we use the property that when two angles are equal , the sides opposite to the two angles will also be equal and hence in this case AB will always be equal to BC



We can, but not in this case

Here is an explanation to the property:

https://gradestack.com/CBSE-Class-9th-C ... -study-wtw
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Re: Comparison AB or BC [#permalink] New post   11 Jan 2019, 16:53
kunalkmr62 wrote:
Cannot we use the property that when two angles are equal , the sides opposite to the two angles will also be equal and hence in this case AB will always be equal to BC

No, they are in different triangle here.
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Re: Comparison AB or BC [#permalink] New post   29 Aug 2019, 06:44
Now, if we simply had the little box showing that the angle formed with the base was a right angle, then I'm confident we could say the segments are equal because segments an equal distance away formed by equal size angles should be equal.

Since we don't have that, based on Brent's illustration, we can't make that conclusion are any definite conclusion about the segment sizes.
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AB or BC [#permalink] New post   30 Nov 2022, 08:38
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Attachment:
screenshot.1102.jpg
screenshot.1102.jpg [ 13.04 KiB | Viewed 4006 times ]


Quantity A
Quantity B
AB
BC



A) Quantity A is greater.
B) Quantity B is greater.
C) The two quantities are equal.
D) The relationship cannot be determined from the information given.


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Re: AB or BC [#permalink] New post   02 Dec 2022, 10:14
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We have information about ONLY the angle 30° and we can infer that the angle at the bottom is 90° No more than this

without any other information is impossible to calculate the length of any side of the triangle or part of them

D is the answer
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Re: AB or BC [#permalink] New post   02 Dec 2022, 18:29
Wouldn't the information given make angles B and C both 60 degrees and thus make the triangle equal? Is it possible that the angles are all equal but one side of the triangle is bigger than the other?
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AB or BC [#permalink] New post   02 Dec 2022, 18:55
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rainer85 wrote:
Wouldn't the information given make angles B and C both 60 degrees and thus make the triangle equal? Is it possible that the angles are all equal but one side of the triangle is bigger than the other?


It would if angle DBC was 90 degrees. But in the wonderland of GRE tests, just because an angle looks like it's 90 degrees doesn't mean it is 90 degrees.

Geometric figures are not drawn to scale.

Hope this helps clarify things.
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Re: AB or BC [#permalink] New post   03 Dec 2022, 02:25
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rainer85 wrote:
Wouldn't the information given make angles B and C both 60 degrees and thus make the triangle equal? Is it possible that the angles are all equal but one side of the triangle is bigger than the other?


Not possible what you said.

the sides are in the same ratio of the angles
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Re: AB or BC [#permalink] New post   13 Apr 2023, 21:22
If both angles are same then AB = BC right ?
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Re: AB or BC [#permalink] New post   13 Apr 2023, 23:43
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yes
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Re: AB or BC [#permalink] New post   14 Apr 2023, 04:01
Carcass wrote:
yes

But OA is D
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Re: AB or BC [#permalink] New post   14 Apr 2023, 05:12
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Ok let be clear on this. Because I believed you posed a hypothetical question............anyway


We can have the first scenario in which the two angles are 90° and the angles A and C are 60°


Attachment:
screenshot.1261.jpg
screenshot.1261.jpg [ 77.93 KiB | Viewed 3593 times ]


In this case the answer is C. AB = BC

But if one side is shorter than the other we know that the two angles A and C are NOT equal. C < A. Therefore AB > BC

Attachment:
screenshot.1262.jpg
screenshot.1262.jpg [ 63.27 KiB | Viewed 3617 times ]


D is the answer
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Re: Comparison AB or BC [#permalink] New post   08 Aug 2025, 03:26
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