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ELYAC Realty
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Stuart Kovinsky
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 Posted: Sat Aug 30, 2008 2:01 am Post subject: Re: Quasi Cylinder Question? |
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| ELYAC Realty wrote: | Why is pie used if ultimately this is a rectangle? Unless they want us to treat it as a cylinder? Any help would be great.
Thanks |
Because everyone loves pie!
Well, ok, because this isn't a rectangle.
The belt is wrapped around two semi-circles, so the length of the belt is 2 (length "L" between centres of circles) + 2(circumference of semi-circle).
We know that the diameter of each circle is 1, so the circumference of a full circle (which is the same as 2*(circumference of each semicircle)) is pi.
Therefore, we can come up with the equation:
2L + pi = 15
2L = 15 - pi
L = (15 - pi)/2
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ELYAC Realty
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| Posted: Sat Aug 30, 2008 2:10 am Post subject: |
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Thanks for your reply.
When you drawn a vertical line through both circles, doesn't that make it a rectangular?
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something like this, just imagine the lines are all straight. Is that all they want to know?
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ELYAC Realty Los Angeles Real Estate Agents Specializing in Foreclosure Homes for Sale, Home Loans, and Mortgage Brokers
310.562.0572
Web: www.elyacrealty.com
Blog: http://elyacrealty.wordpress.com/
Services: http://elyacrealty.com/losangelesrealestateagents/ |
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Stuart Kovinsky
GMAT Instructor
Joined: 08 Jan 2008
Posts: 1225
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Thanked 203 times in 185 posts
Location: Toronto
GMAT Score: 800
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| Posted: Sat Aug 30, 2008 7:56 am Post subject: |
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| ELYAC Realty wrote: | Thanks for your reply.
When you drawn a vertical line through both circles, doesn't that make it a rectangular?
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something like this, just imagine the lines are all straight. Is that all they want to know? |
You could draw a rectangle, but since the belt goes around the circles, not through them, the rectangle is irrelevant to the question.
_________________
Stuart Kovinsky, B.A. LL.B.
Academic Co-ordinator
Kaplan Test Prep & Admissions
Toronto Office
1-800-KAP-TEST
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ELYAC Realty
Rising GMAT Star
Joined: 30 Aug 2008
Posts: 30
Thanks given: 6
Thanked 0 times in 0 posts
Location: Los Angeles CA
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| Posted: Sat Aug 30, 2008 9:09 am Post subject: |
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I guess my confussion was with the questions. Bc my understanding was that they want the distance from one point to the next, which turns out to be the length of "L", but then you wold have to subtract the circumference of 2 half circles or one full circle. Got it. Thanks!
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ELYAC Realty Los Angeles Real Estate Agents Specializing in Foreclosure Homes for Sale, Home Loans, and Mortgage Brokers
310.562.0572
Web: www.elyacrealty.com
Blog: http://elyacrealty.wordpress.com/
Services: http://elyacrealty.com/losangelesrealestateagents/ |
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