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Bob plans to draw a square ABCD with a point O on the side AB but is

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Manager
Joined: 14 Mar 2014
Posts: 148
GMAT 1: 710 Q50 V34
Bob plans to draw a square ABCD with a point O on the side AB but is [#permalink]

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25 Aug 2015, 21:44
2
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Question Stats:

71% (01:09) correct 29% (01:22) wrong based on 85 sessions

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Bob plans to draw a square ABCD with a point O on the side AB but is not successful. Why is Bob unable to draw the square?

(1) The length of OD is twice that of OC.

(2) The length of OD is 4 cm.
[Reveal] Spoiler: OA

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I'm happy, if I make math for you slightly clearer
And yes, I like kudos
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Last edited by Bunuel on 25 Aug 2015, 22:45, edited 1 time in total.
Renamed the topic and edited the question.
Intern
Joined: 06 Jul 2015
Posts: 21
Re: Bob plans to draw a square ABCD with a point O on the side AB but is [#permalink]

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02 Jul 2016, 12:05
Imagine that the point is the point A then ratio of OD to OC would be side : diagonal.
Assume that ABCD is a square, then that ratio comes out the be s:s \sqrt{2} which is 1: \sqrt{2}.
Since diagonal is of maximum length in a square, the max ratio will always be 1: \sqrt{2}.
There is not point on the side of the square which can exceed this ratio if it has to be on the side of square.
1: 2 greater than 1:\sqrt{2}. Therefore, Statement 1 is sufficient to prove that a square cannot be drawn.
Statement 2 does not provide any valuable additional information and hence is insufficient.
Senior Manager
Joined: 20 Feb 2015
Posts: 387
Concentration: Strategy, General Management
Re: Bob plans to draw a square ABCD with a point O on the side AB but is [#permalink]

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02 Jul 2016, 23:37
(1) The length of OD is twice that of OC.

the largest distance between any two points within a square is the diagonal.

if the side of the square is A then the diagonal is Aroot2, as per the question though OD=2OC .The square is thus not possible to draw with the given criteria . Thus sufficient

(2) The length of OD is 4 cm.

insufficient.
Director
Joined: 12 Nov 2016
Posts: 790
Re: Bob plans to draw a square ABCD with a point O on the side AB but is [#permalink]

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15 Mar 2017, 18:56
I got this question right through intuition but can someone diagram it for me? I don't actually understand the logic behind this question.
Intern
Joined: 03 Sep 2016
Posts: 15
Re: Bob plans to draw a square ABCD with a point O on the side AB but is [#permalink]

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03 Aug 2017, 06:49
The longest line we can inscribe in a square is its diagnol(BD). let length of a side of square is a. Then diagnol (BD) = aroot2 (45-45-90).
Now lets draw point O near to B making OC approximately equal to BC (OC=a). Now according to question OD=2OC but we know that BD is the longest and its value is just aroot 2. So a square cannot be drawn.
Re: Bob plans to draw a square ABCD with a point O on the side AB but is   [#permalink] 03 Aug 2017, 06:49
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