ROTATIONS Review Mrs. Erickson

Rotations Like the steering wheel of a car Fixed point in the center, everything else turns You get the same picture, just rotated

Rotations What is preserved?  distance is preserved  angle measure is preserved  midpoint is preserved  collinearity is preserved Rotations are counterclockwise If the angle is negative, go clockwise Rule: R O,90 (x,y) = (-y,x) or R 90 (x,y)=(-y,x)

Rotations Rotational Symmetry if the figure is its own image (360° in a circle)  Square  Rectangle  Equilateral Triangle  Pentagon

Don’t forget to do your homework S Gudder: “The essence of mathematics is not to make simple things complicated, but to make complicated things simple.”