Geometry Pre-AP Vocab 1.1 Part I
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Created by:
cyxdubiel on August 28, 2011
Subjects:
Description:
I have Ms. Mulder
1.1 is 1st week of the 1st 6th weeks
Classes:
Freshman Study Group 11' - 12'
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14 terms
Terms | Definitions |
|---|---|
 translation | a transformation along a vector such that each segment joining a point and its image has the same length as the vector and is parallel to the vector |
| vector | a straight line segment whose length is magnitude and whose orientation in space is direction (Despicable Me movie!) |
| horizontal translation along vector (a,0) | (x, y) -> (x+a, y) |
| vertical translation along vector (0,b) | (x, y) _> (x, y+b) |
| genreral translation along vector (a,b) | (x, y) _> (x+a, y+b) |
| rotation | a transformation about a point P, called the center of rotation, such that each point and its image are the same distance from P, and such that all angles with vertex P formed by a point and its image are congruent |
| origin | the point of intersection of coordinate axes |
| 90° rotation about the origin | (x, y) _> (-y, x) |
| 180° rotation about the origin | (x, y) _> (-x, -y) |
| reflection | a transformation across a line, called the line of reflection, so that the line of reflection is the perpendicular bisector of each segment joining each point and its image |
| perpendicular bisector | a segment, ray, line, or plane that is perpendicular to a segment at its midpoint |
| reflection across the x-axis | (x, y) -> (x, -y) |
| reflection across the y-axis | (x, y) -> (-x, y) |
| reflection across the line y=x | (x, y) -> (y, x) |
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