
RE: Geometry Question #3
Posted:
Jun 17, 2009 8:12 AM



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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