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In the ||gm, it is given AB=8 and BO=6 find BC

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Director
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In the ||gm, it is given AB=8 and BO=6 find BC [#permalink] New post 11 Aug 2013, 02:12
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In the parallelogram as shown in the figure, it is given AB=8 and BO=6 find BC

See attached all values are in cms:

Please note that 45 degrees as mentioned in attached is not mentioned in the question as I took the image from solutions.


(a). 12cm
(b). 2 sqrt(14) cm
(c). 2 sqrt(7) cm
(d). 10 cm
(e). 2 sqrt(11) cm

Source: Some document I had from internet
[Reveal] Spoiler: OA

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Last edited by TGC on 18 Aug 2013, 21:24, edited 2 times in total.
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Re: In the ||gm, it is given AB=8 and BO=6 find BC [#permalink] New post 11 Aug 2013, 02:26
Expert's post
targetgmatchotu wrote:
In the ||gm, it is given AB=8 and BO=6 find BC

See attached all values are in cms:


(a). 12cm
(b). 2 sqrt(14) cm
(c). 2 sqrt(7) cm
(d). 10 cm
(e). 2 sqrt(11) cm

Source: Some document I had from internet


\angle AOD = 90 degree. Thus, \angle OAD = 45degrees\to OD = AO(sides opposite equal angles are equal).

Also, AO^2 = 8^2-6^2 = 28. Now, in triangle AOD, AD^2 = AO^2+OD^2 = 2*AO^2 \to AD = 2\sqrt{14}.
As it is mentioned that ABCD is a parallelogram, AD = BC =2\sqrt{14}
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Director
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Joined: 03 Aug 2012
Posts: 893
Concentration: General Management, General Management
Schools: ISB '16
GMAT 1: 630 Q47 V29
GMAT 2: 680 Q50 V32
GPA: 3.7
Followers: 12

Kudos [?]: 187 [0], given: 304

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Re: In the ||gm, it is given AB=8 and BO=6 find BC [#permalink] New post 11 Aug 2013, 03:09
mau5 wrote:
targetgmatchotu wrote:
In the ||gm, it is given AB=8 and BO=6 find BC

See attached all values are in cms:


(a). 12cm
(b). 2 sqrt(14) cm
(c). 2 sqrt(7) cm
(d). 10 cm
(e). 2 sqrt(11) cm

Source: Some document I had from internet


\angle AOD = 90 degree. Thus, \angle OAD = 45degrees\to OD = AO(sides opposite equal angles are equal).

Also, AO^2 = 8^2-6^2 = 28. Now, in triangle AOD, AD^2 = AO^2+OD^2 = 2*AO^2 \to AD = 2\sqrt{14}.
As it is mentioned that ABCD is a parallelogram, AD = BC =2\sqrt{14}


Sorry for that the angle given in the diagram as 45 degrees was not given in the question stem.I think I took the image from the solution and apologies for that.

You may now proceed again

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Re: In the ||gm, it is given AB=8 and BO=6 find BC [#permalink] New post 13 Sep 2013, 08:35
i still can't understand how they got 45 degrees..but after that its a simple answer...
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Re: In the ||gm, it is given AB=8 and BO=6 find BC [#permalink] New post 13 Sep 2013, 14:04
Agreed, I don't see how you are getting 45 degrees from what has been discussed so far.
Re: In the ||gm, it is given AB=8 and BO=6 find BC   [#permalink] 13 Sep 2013, 14:04
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In the ||gm, it is given AB=8 and BO=6 find BC

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