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Topic: Geometry Question #3
Replies: 39   Last Post: Jun 18, 2009 5:05 PM

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reuterg@canandaiguaschools.org

Posts: 15
Registered: 2/18/05
RE: Geometry Question #3
Posted: Jun 17, 2009 8:12 AM
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att1.html (1.7 K)

Hi all,

I'm just wondering... have we assumed that the rotation was 180 degrees? If the rotation was 181 degrees or 179 degrees, then a dilation of factor -1 is an incorrect choice.

The picture could be interpreted as a dilation, but it must be interpreted as a rotation.

Regards,
George Reuter
Canandaigua Academy


Geometry Question #3: We had students identify the transformation as a dilation (of -1). I called the State to see if they would allow credit if a student chose choice #2 dilation. Their response: "No because there are too many assumptions that must be made." And they wanted proof that a rotation of 180 degrees is the same as a dilation of -1. Apparently this is not common knowledge in the math world. Very frustrating.....very frustrating.....



Ed Mertson

Newark Valley High School

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Date Subject Author
6/16/09
Read Geometry Question #3
edward mertson
6/17/09
Read Re: Geometry Question #3
Jonathan Halabi
6/17/09
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Roberta Silver
6/17/09
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reuterg@canandaiguaschools.org
6/17/09
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edward mertson
6/17/09
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reuterg@canandaiguaschools.org
6/17/09
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edward mertson
6/17/09
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BHowitt@wlsv.org
6/17/09
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Tom Kenyon
6/17/09
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Storey, Dolores
6/17/09
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Roberta Silver
6/17/09
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Storey, Dolores
6/17/09
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reuterg@canandaiguaschools.org
6/17/09
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Virginia Kuryla
6/17/09
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PJ Manzo
6/18/09
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cindy@wcs
6/17/09
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kgilbert@twcny.rr.com
6/18/09
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cindy@wcs
6/17/09
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6/17/09
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Jonathan Halabi
6/17/09
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Roberta Silver
6/17/09
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Storey, Dolores
6/17/09
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Tom Kenyon
6/17/09
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Kathy
6/17/09
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Tennantij@aol.com
6/17/09
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MathCaryl@aol.com
6/18/09
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ELEANOREVO@aol.com
6/18/09
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Sharon
6/18/09
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Eleanor Pupko
6/18/09
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Jonathan Halabi
6/18/09
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Sharon
6/18/09
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djud@optonline.net
6/18/09
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Tennantij@aol.com
6/18/09
Read non-regents geometry textbook
Brent Neeley
6/18/09
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Tennantij@aol.com
6/18/09
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Sharon
6/18/09
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Jonathan Halabi
6/18/09
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Sharon
6/18/09
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StGOLD2112@aol.com
6/18/09
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MathCaryl@aol.com

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