Rigid Transformations
Dilations 1
Dilation 2
Scale Factor
100
To "flip" a figure over a line
Reflection
100
True or False? Dilations always make a figure smaller.
False
100
Is a dilation of 5 an enlargement or reduction?
Enlargement (Gets bigger)
100
How do I find the perimeter of the new figure after a dilation?
MULTIPLY BY SCALE FACTOR!!!!!
200
To "slide" a figure.
Translation
200
A dilation might change the size of a figure's side lengths but never change the _______.
(WORD BANK: area, similar, side lengths, angles)
angles
200
What transformations does NOT preserve congruence?
(Translation, Reflection, Rotation, Dilation)
Dilations
200
What is the formula to find scale factor?
NEW divided by ORIGINAL
New
OG
300
To "turn" a figure clockwise or counter clockwise
Rotation
300
Dilations always produce ___________ figures.
(WORD BANK: area, similar, congruent, angles)
similar
300
If the scale factor is greater than 1 (ex:2) then the dilated image is ______________ from the original figure.
Enlarged
300
Point A has the coordinates (4, -3).
What is the scale factor used if the new coordinates of A' are (2, - 1.5)?
Scale factor = 1/2 or 0.5
400
Write an algebraic rule for a TRANSLATION.
(x, y) --> ( x+2, y-7)
Adding and subtracting!!
400
What does this symbol mean?
≅
CONGRUENT
400
If the scale factor is less than 1 (ex:1/4) then the dilated image is ____________ from the original figure.
Reduced
400
How do I find the AREA of the new figure after a dilation?
MULTIPLY BY THE SCALE FACTOR SQUARED
500
If the x and y switch places in the algebraic rule, the transformation is a _____.
Rotation of 90° or 270°
500
If a square is dilated using a scale factor of 2, how many times larger will the area of the new square area be?
4 times larger
(22)
500
Dilations can result in a CONGRUENT figure ONLY if their scale factor is this number. What is this number?
1
500
These two triangles are similar. Find the missing side lengths.
t=15 s=12