Basics
What is the center of rotatation?
A point around which a figure rotates.
What is the rule for rotating (x, y) 90° counterclockwise?
(-y, x)
A rotation of 90° counterclockwise is the same as this rotation clockwise.
270 degrees
Clockwise and Counterclockwise
What is the rule for rotating (x, y) 180?
(-x, -y)
A negative degree of rotation means the direction is this.
Clockwise
What is original position?
A full 360 rotation brings a figure back to this.
What is the rule for rotating (x, y) 90° clockwise?
(y, -x)
The number of degrees in one full revolution.
360 degrees
The image of point (3,4) after a 90° counterclockwise rotation.
(-4,3)
What is the rule for rotating (x, y) 270° counterclockwise?
(y, -x)
The direction of a positive angle of rotation
Counterclockwise
The image of point (6,-3) after a 270° counterclockwise rotation.
(-3,-6)
What is the effect of rotating a figure 360 degrees?
No change
The rotation that results in the same final position as a 180° rotation
-180 degree clockwise rotation