Dilation
What is dilation?
the action of making an object bigger or smaller
What is rotation
flipping the figure
You can reflect about a line of
Symmetry
True or False: If you slide your point to the right, you do (y+2)
True
When scale factor is less than 1 your image becomes ?
smaller
What is the rule for 90 degrees counter clockwise?
(x,y) —> (-y,x)
When an object reflected it‘s size is always the
Same
True or False: Translation is a rigid motion.
True
If an image after a dilation centered at the origin (0,0) with scale factor “k” what is the point?
P’(ky,ky)
What type of motion is rotation
Rigid
Given the point (4,-5) reflect over the line y=-x
(x,y) -> (-y,-x)
(5,-4)
Point (6,4) translate 2 units left.
(4,4)
If a dilation with center of dilation C & scale factor “k” maps every point P in a figure to a point P’ what things are true?
a) if P is the center point C then P=P’
b) if P is not the center point c then the image point P’ lies on CP
c) angle measures are not preserved
When a point (a,b) is rotated clockwise about the origin what is 180 degrees clockwise
180 - (x,y)—> (-x,-y)=180
C (10,4) C’(10,-4), what is the line of reflection
X-axis
Move the coordinate (12,6) x+9, y-12
(21,-6)