Is quadrilateral RSTV a rectangle? : GMAT Data Sufficiency (DS)
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19 Apr 2012, 12:15
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(1) The measure of ∠RST is 90o
(2) The measure of ∠TVR is 90o
[Reveal] Spoiler: OA

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Last edited by Bunuel on 19 Apr 2012, 12:25, edited 1 time in total.
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19 Apr 2012, 12:27
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shikhar wrote:

(1) The measure of ∠RST is 90o
(2) The measure of ∠TVR is 90o

It's clear E. Sure RSTV can be a rectangle but it also can be a kite:
Attachment:

Kite.png [ 4.09 KiB | Viewed 4162 times ]

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20 Apr 2012, 19:26
Nice got it right, went with E since both stems give the opposite angles and not the adjacent angles, it can be a diamond.
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21 Apr 2012, 02:08
yeah right missed this figure :) Thanks
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05 Aug 2013, 19:22
The figure can be a square too. We cannot say unless we have info about the length of sides.
straight E.
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05 Aug 2013, 21:04
The figure can be a square too. We cannot say unless we have info about the length of sides.
straight E.

RSTV can be a square or rectangle. so double case. Answer (E)
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05 Aug 2013, 22:12
Asifpirlo wrote:
The figure can be a square too. We cannot say unless we have info about the length of sides.
straight E.

RSTV can be a square or rectangle. so double case. Answer (E)

Square is a kind of rectangle, which has equal sides. Therefore, it is not double csse.

The reason why E is the answer is that we can draw figures with angles different from 90º.
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27 Mar 2014, 07:04
Bunuel wrote:
shikhar wrote:

(1) The measure of ∠RST is 90o
(2) The measure of ∠TVR is 90o

It's clear E. Sure RSTV can be a rectangle but it also can be a kite:
Attachment:
Kite.png

Can you provide some more explanation here.
1. Straight lines never bends...even at infinity.
2. In your kite example angle at S and V is 90, but then line started bending inwards, making it a kite.
3. Mathematically lines originating from angle S and V will travel straight and intersect other lines perpendicularly. i.e Only applicable when opposite ends are at 90.

Real life example, open MS Paint and see how we draw rectangles in it. You click at one end and drag cursor diagonally. one can see opposite ends at right angle.
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27 Mar 2014, 07:38
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dangeyg wrote:
Bunuel wrote:
shikhar wrote:

(1) The measure of ∠RST is 90o
(2) The measure of ∠TVR is 90o

It's clear E. Sure RSTV can be a rectangle but it also can be a kite:
Attachment:
The attachment Kite.png is no longer available

Can you provide some more explanation here.
1. Straight lines never bends...even at infinity.
2. In your kite example angle at S and V is 90, but then line started bending inwards, making it a kite.
3. Mathematically lines originating from angle S and V will travel straight and intersect other lines perpendicularly. i.e Only applicable when opposite ends are at 90.

Real life example, open MS Paint and see how we draw rectangles in it. You click at one end and drag cursor diagonally. one can see opposite ends at right angle.

Frankly I don't see the lines bending inwards in the figure. Anyway, are you implying that such figure is not possible? If yes, then you are wrong:
Attachment:

Untitled.png [ 5.18 KiB | Viewed 2537 times ]
The angles marked as right must be right because if an inscribed triangle has diameter as its hypotenuse then the triangle must be right angled. So, we can inscribe a right triangle in a circle and then draw its mirror image around the hypotenuse to get a kite.

Hope it's clear.
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09 Aug 2016, 02:40
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