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Joined: 16 Jul 2009
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New post 08 Aug 2009, 07:11
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Question Stats:

100% (00:03) correct 0% (00:00) wrong based on 2 sessions

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Please find attached.

thank u all for your help

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New post 08 Aug 2009, 08:09
The OA is correct.

Basically, the question is asking:
Area(circular glass piece + metal frame) - Area (circular glass piece)

Radius of medallion is given as r cm (note that medallion includes the glass piece and the metal frame),
therefore, Area(circular glass piece + metal frame) = \(PI(r)^2\)

Width of metal frame is s cm, therefore the radius of glass piece only become, (r-s) cm
Area (circular glass piece) = \(PI(r-s)^2\)

Giving us:
\(PI(r)^2\) - \(PI(r-s)^2\) = \(PI(r^2 - (r-s)^2)\) = \(PI*S(2r-s)\)
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Joined: 16 Jul 2009
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Schools: CBS
WE 1: 4 years (Consulting)
Re: circle  [#permalink]

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New post 08 Aug 2009, 09:10
scarish wrote:
The OA is correct.

Basically, the question is asking:
Area(circular glass piece + metal frame) - Area (circular glass piece)

Radius of medallion is given as r cm (note that medallion includes the glass piece and the metal frame),
therefore, Area(circular glass piece + metal frame) = \(PI(r)^2\)

Width of metal frame is s cm, therefore the radius of glass piece only become, (r-s) cm
Area (circular glass piece) = \(PI(r-s)^2\)

Giving us:
\(PI(r)^2\) - \(PI(r-s)^2\) = \(PI(r^2 - (r-s)^2)\) = \(PI*S(2r-s)\)


Why does the medallion include the metal frame?

PS: i love your signature
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Re: circle  [#permalink]

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New post 09 Aug 2009, 04:03
noboru wrote:
Why does the medallion include the metal frame?

PS: i love your signature

Because the question says:
"...circular medallion made of a circular piece of coloured glass surrounded by a metal frame..."

So the question is defining medallion made up of two component parts...round glass peice and the metal frame...
Hope it helped..
Cheers.

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.

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The three most significant times in your life are:
1. When you fall in love
2. The birth of your first child
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Re: circle &nbs [#permalink] 09 Aug 2009, 04:03
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