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Re: If A, B and C are distinct points, do line segments AB and BC have the [#permalink]

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19 Sep 2017, 10:19

I thought since A B C and D form a rectangle, there is no way AB = BC no matter how you draw it. Shouldn't the answer be A?

Official explanation as below: Explanation: Statement (1) is insufficient. If AB and BC are two sides of a rectangle, they might be equal, but they might not be. Also, it's possible that they are not both sides of a rectangle: it's possible that one of them is a diagonal of the resulting rectangle. Statement (2) is also insufficient. This tells us nothing about BC. Taken together, the statements are still insufficient. If AB, AC, and BC are all sides of a rectangle, we know that AB and AC are one each of the different dimensions. However, we don't know that BC has the same length as AB; it could have the same length as AC. And further, there is still the possibility that one of these segments is the diagonal of the rectangle. Choice (E) is correct.

Statement 1 doesn't make sense for me since if AB and BC are considered two sides that are equal how would you even form a rectangle with D?

Re: If A, B and C are distinct points, do line segments AB and BC have the [#permalink]

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19 Sep 2017, 15:05

rajudantuluri wrote:

I thought since A B C and D form a rectangle, there is no way AB = BC no matter how you draw it. Shouldn't the answer be A?

Official explanation as below: Explanation: Statement (1) is insufficient. If AB and BC are two sides of a rectangle, they might be equal, but they might not be. Also, it's possible that they are not both sides of a rectangle: it's possible that one of them is a diagonal of the resulting rectangle. Statement (2) is also insufficient. This tells us nothing about BC. Taken together, the statements are still insufficient. If AB, AC, and BC are all sides of a rectangle, we know that AB and AC are one each of the different dimensions. However, we don't know that BC has the same length as AB; it could have the same length as AC. And further, there is still the possibility that one of these segments is the diagonal of the rectangle. Choice (E) is correct.

Statement 1 doesn't make sense for me since if AB and BC are considered two sides that are equal how would you even form a rectangle with D?

Is this a poor made question?

Bunuel, would appreciate your thoughts here.

AB and BC are 2 line segments.

statement 1 : D ,A,B, C forms a rectangle : So only two combinations of rectangle can be formed : if we go clockwise 1: ABCD or 2: ABDC. In both cases as formed figure is rectangle opposite sides are equal and adjacent sides are not equal. Also length, breadth and diagonal have different lengths. So in all cases: Whether AB and BC forms 2 sides of rectangle or 1 form a side and other 1 is diagonal, AB never equals to BC. Sufficient

Statement 2: AB != AC . Just tells about 2 sides of ABC triangle. Insufficient

Answer: A

rajudantuluri : As per official explanation , we will not get the answer by statement 1 if we consider the point that " All rectangles are squares but all squares are not rectangle" So by this if question stem says ABCD is a rectangle : it can be a rectangle(opp sides equal) or it can be a square(all sides equal). But i am not sure if this point need to be considered here.

Re: If A, B and C are distinct points, do line segments AB and BC have the [#permalink]

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19 Sep 2017, 16:05

Nikkb wrote:

rajudantuluri wrote:

I thought since A B C and D form a rectangle, there is no way AB = BC no matter how you draw it. Shouldn't the answer be A?

Official explanation as below: Explanation: Statement (1) is insufficient. If AB and BC are two sides of a rectangle, they might be equal, but they might not be. Also, it's possible that they are not both sides of a rectangle: it's possible that one of them is a diagonal of the resulting rectangle. Statement (2) is also insufficient. This tells us nothing about BC. Taken together, the statements are still insufficient. If AB, AC, and BC are all sides of a rectangle, we know that AB and AC are one each of the different dimensions. However, we don't know that BC has the same length as AB; it could have the same length as AC. And further, there is still the possibility that one of these segments is the diagonal of the rectangle. Choice (E) is correct.

Statement 1 doesn't make sense for me since if AB and BC are considered two sides that are equal how would you even form a rectangle with D?

Is this a poor made question?

Bunuel, would appreciate your thoughts here.

AB and BC are 2 line segments.

statement 1 : D ,A,B, C forms a rectangle : So only two combinations of rectangle can be formed : if we go clockwise 1: ABCD or 2: ABDC. In both cases as formed figure is rectangle opposite sides are equal and adjacent sides are not equal. Also length, breadth and diagonal have different lengths. So in all cases: Whether AB and BC forms 2 sides of rectangle or 1 form a side and other 1 is diagonal, AB never equals to BC. Sufficient

Statement 2: AB != AC . Just tells about 2 sides of ABC triangle. Insufficient

Answer: A

rajudantuluri : As per official explanation , we will not get the answer by statement 1 if we consider the point that " All rectangles are squares but all squares are not rectangle" So by this if question stem says ABCD is a rectangle : it can be a rectangle(opp sides equal) or it can be a square(all sides equal). But i am not sure if this point need to be considered here.

May you please tell source of the question?

I got this from one of Jeff Sackmann's question sets.

Bunuel : Does GMAT uses rectangle word for both square and rectangle ? In questions where we have given suppose PQRS is a rectangle. In such cases we always assume measurement l*b and not a*a. Is this wrong?

Bunuel : Does GMAT uses rectangle word for both square and rectangle ? In questions where we have given suppose PQRS is a rectangle. In such cases we always assume measurement l*b and not a*a. Is this wrong?

All squares are rectangles, so PQRS being a rectangle does not rule out possibility of it being a square.
_________________

Re: If A, B and C are distinct points, do line segments AB and BC have the [#permalink]

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22 Sep 2017, 07:35

Thanks Bunuel! Those two figures make this a lot more clearer to me now. I just assumed a rectangle is a rectangle! Like you said, all squares are rectangles too. Broke the first rule of Geometry, DO NOT ASSUME!

Re: If A, B and C are distinct points, do line segments AB and BC have the [#permalink]

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23 Sep 2017, 09:29

While this is undisputed fact that all squares are rectangles, has there been an official question which has tested this notion? Bunuel, it would great if you can quote some questions from the top of your head.