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Geometry Honors

Geometry Honors Module 2 Vocab

TermDefinition
Vector A quantity that has both direction and magnitude. A vector is named starting with the initial point, and ending with the terminal point.
Initial point The starting point of a vector.
Terminal point The ending point of a vector.
Translation A transformation along a vector such that the segment joining a point and its image has the same length as the vector and is parallel to the vector.
Component form A way to write the translation of a vector.
Perpendicular lines Lines that intersect at right angles.
Perpendicular bisector A line perpendicular to a line segment at the segment's midpoint.
Rule for a reflection across the x-axis (x,y)->(x,-y)
Rule for a reflection across the y-axis (x,y)->(-x,y)
Rule for a reflection across the line y=x (x,y)->(y,x)
Rule for a reflection across the line y=-x (x,y)->(-y,-x)
Center of rotation The point the figure is rotating around.
Angle of rotation The angle by which the figure is being rotated by.
Rule for a rotation of 90 degrees counterclockwise (x,y)->(-y,x)
Rule for a rotation of 180 degrees (x,y)->(-x,-y)
Rule for a rotation of 270 degrees counterclockwise (x,y)->(y,-x)
Rule for a rotation of 360 degrees (x,y)->(x,y)
Line symmetry A line that reflects a figure onto itself.
Rotational symmetry A rotation that maps a figure onto itself.
Angle of rotational symmetry The smallest angle of rotation that maps a figure onto itself. The angle has to be greater than 0 degrees but less than or equal to 180 degrees.
Created by: prettyinpurple
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