Big Ideas Chapter 9 Geometry

The rule for rotation of 270 degrees counterclockwise is

(x, y) --> _

• (y, -x)

• (-y, x)

• (x, -y)

• (-x, y)

What is the rule for the following reflection?

• Reflection across y = −2

• Reflection across x = −2

• Reflection across x = 2

• Reflection across y = 2

Reflect the shape over the line y = x. Where is A'?

• (7, 2)

• (-2, 7)

• (2, -7)

• (-7, -2)

Which would be the correct notation for the composition of transformations from blue to red to green?

• <-4,0> then Reflection in _{y axis}

• Reflection in _{y axis} then <0, -4>

• <0, -4> then Reflection in _{y axis}

• Reflection in _{x axis} then Reflection in _{y axis}

Dilate the figure by a scale factor of 3 with the origin as the center of dilation. What are the coordinates of the image?

• A'(9,9) B'(18,18) C'(27,9)

• A'(6,6) B'(9,9) C'(12,6)

• A'(0,0) B'(3,3) C'(6,0)

• A'(1,1) B'(2,2) C'(3,1)

Is the dilation from A to B an enlargement or a reduction?

• enlargement

• reduction

Jordan is putting a photo of the lacrosse team in a full-page layout in the yearbook. The original photo is 4 inches by 6 inches. If the photo in the yearbook is 6 inches by 9 inches, what is the scale factor of the dilation?

• k = 1/2

• k = 5

• k = 3/2

• k = 9

One side of a triangle on the coordinate plane is 4 units long. If it undergoes a dilation about the origin with a scale factor of 2, what will the length be?

• 2

• 4

• 8

• 16

What is the sequence of transformations for the image given?

• Reflect over the x-axis, translate (x+8,y)

• Reflect over the x-axis then translate (x+6, y)

• Reflect over the y-axis then (x+1, y+1)

• Translate down 4 (y-4) and to the right 5 (x+5)

Which scale factor shrinks a figure?

• k = 0

• k =2

• k= 1/3

• k = 1