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KillerSquirrel
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Attached - have fun 26 Oct 2007, 04:56
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Attached - have fun !

:)



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Fig
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Attached - have fun 26 Oct 2007, 05:38
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(A) too :)

If BQ = CR = DS = AP, then the shapes of the 4 pieces are the same. That implies PR and QS are composed of 1 long and 1 small "interior" sides.

And so, PR = QS.

The fact that we know the perimeter is useless...
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GK_Gmat
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Attached - have fun 26 Oct 2007, 06:38
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Fig
(A) too :)

If BQ = CR = DS = AP, then the shapes of the 4 pieces are the same. That implies PR and QS are composed of 1 long and 1 small "interior" sides.

And so, PR = QS.

The fact that we know the perimeter is useless...
Show more


Fig, can you pls. explain how you go from 'BQ = CR = DS = AP' to 'the shapes of the 4 pieces are the same'

If BQ = CR = DS = AP, then QC = RD = AS = PB, since it is a square. How do you proceed from here?
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abiswas
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Attached - have fun 26 Oct 2007, 07:00
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Ans A
Since BQ = CR = SD = AP ;
As sides of a square are equal :
PB = AS = DR = QC
Again each angle i.e B , C , D , A must be 90(angles of a square)
hence their opp angles must be 90. So figures are actually rectangles with PR = QS
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Fig
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Attached - have fun Updated on: 26 Oct 2007, 07:07
Originally posted by Fig on 26 Oct 2007, 07:03.
Last edited by Fig on 26 Oct 2007, 07:07, edited 1 time in total.
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GK_Gmat
Fig
(A) too :)

If BQ = CR = DS = AP, then the shapes of the 4 pieces are the same. That implies PR and QS are composed of 1 long and 1 small "interior" sides.

And so, PR = QS.

The fact that we know the perimeter is useless...

Fig, can you pls. explain how you go from 'BQ = CR = DS = AP' to 'the shapes of the 4 pieces are the same'

If BQ = CR = DS = AP, then QC = RD = AS = PB, since it is a square. How do you proceed from here?
Show more


Well, I can try :)

As BQ = CR = DS = AP, we know that QC = RD = SA = BP because we have a square with each side thus equal.

Then, at this point, we know that the triangles BQP, QCR, RDS and SAP are right similar triangles.

That implies that PQ=QR=RS=SP.

In addition, each angle of PQRS are rights by the following reasonning:
o angle(PQR) = 180 - angle(BQP) - angle(RQC)
= 180 - (90-angle(BPQ)) - angle(RQC) as BQP is a right triangle
= 90 + angle(BPQ) - angle(RQC)
= 90 + angle(BPQ) - angle(BPQ) as BPQ and RQC are similar triangles
= 90

We are thus now with PQRS definied by:
o 4 equal sides
o 4 right angles

It's the definition of a square and that means its diagonals PR and QS are equal.
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Fig
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Attached - have fun 26 Oct 2007, 07:04
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abiswas
Ans A
Since BQ = CR = SD = AP ;
As sides of a square are equal :
PB = AS = DR = QC
Again each angle i.e B , C , D , A must be 90(angles of a square)
hence their opp angles must be 90. So figures are actually rectangles with PR = QS
Show more


Faster taped than I did ;)
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KillerSquirrel
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Attached - have fun 26 Oct 2007, 08:48
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the OA is (A)

:)



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Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
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Thank you for understanding, and happy exploring!
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