Unit 1 End of Unit Review

Translation

Reflection

Rotation

"directed line segment"

also called "vector"

all points move the same distance in the same direction

must refer to the line of reflection

preserves distance and angle measure

does not preserve orientation (clockwise/counterclockwise)

any point ON the line of reflection will not move.

image and preimage are the same distance from the line of reflection

reflection line is the perpendicular bisector of the segment connecting each preimage and image

Center point that does not move in a rotation

angle measure tells how far the object is rotated about the center point

Direction tells whether the turn is clockwise or counterclockwise

all images will be located on the same circle with same center (center of the rotation)

rotations preserve distance, angle measure, and orientation

image and preimage are congruent

Lines of reflection must go through the center of the figure

All points on one side will line up with their corresponding point on the other side of the line

Regular polygons will have the same number of lines of reflections it has sides

When finding lines of reflections of figures, fill and shading will matter.

Center of rotation will be in the center of the figure

One rotation will take the figure onto itself in the smallest angle measure

Angles of rotational symmetry must be between 0° and 360°

360° is NOT an angle rotation symmetry.

To find the angles of rotation symmetry in a regular polygon, divide 360° by the number of angles (or sides).

The number of rotations possible will be one less than the number of angles.