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# circle

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VP
Joined: 16 Jul 2009
Posts: 1223
Schools: CBS
WE 1: 4 years (Consulting)

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08 Aug 2009, 07:11
00:00

Difficulty:

(N/A)

Question Stats:

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

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From GMAT Prep.

thank u all for your help

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Intern
Joined: 01 Aug 2009
Posts: 28
Location: Australia

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

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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VP
Joined: 16 Jul 2009
Posts: 1223
Schools: CBS
WE 1: 4 years (Consulting)

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

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?

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Intern
Joined: 01 Aug 2009
Posts: 28
Location: Australia

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

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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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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