Plane Geometry and Similarity

What is the scale factor from ΔDEF to ΔABC?

• 1/2

• 7/3

• 2

• 10/3

Tags

CCSS.8.G.A.4

CCSS.HSG.SRT.A.2

Suppose AB = 4. After a dilation, A'B' = 10. What is the scale factor for the dilation?

• 5/2

• 10

• 4

• 2/5

Tags

CCSS.8.G.A.3

Did the image enlarge, reduce or none of the above?

• Enlarge

• Reduce

• None of the above

Tags

CCSS.8.G.A.4

CCSS.HSG.SRT.A.2

What scale factor was used to produce the image?

• 2

• -2

• ¹/₂

• 1

Tags

CCSS.HSG.CO.A.2

What scale factor was used to produce the image?

• 2.5

• 1.5

• 3.5

• 4

Tags

CCSS.7.G.A.1

What are the coordinates for the center of dilation?

• (0, 0)

• (-3, -1)

• (-12, 6)

• (-3, -3)

Tags

CCSS.8.G.A.3

The corresponding point for a pre- image that has one vertice at ( 2, 3) and a scale factor of 2 would be at (4, 6).

• True in all cases. It doesn't matter where the center of dilation is located. You simply multiply the coordinates by the scale factor. 

• False. You can't use the scale factor to find the coordinates of the corresponding vertice.

• True, assuming that the center of dilation is at the origin.

• False, the corresponding vertice would have coordinates of (4, 5)

Tags

CCSS.8.G.A.3

The center of dilation is important because

• it's the location from which the dilation occurs.

• All of the corresponding points of the image and pre image are on the lines radiating from the Center of Dilation.

• it's a fixed point on the plane about which all points are expanded or contracted.

• All of the above

Tags

CCSS.8.G.A.3

When a dilation has a scale factor greater than one, the dilation is an enlargement.

• True

• False

Tags

CCSS.8.G.A.3

Which of the following is the algebraic representation for a dilation?

• (x, y) → (x, 3y)

• (x, y) → (3x, 3y)

• (x, y) → (x, y - 3)

• (x, y) → (.5x, .4y)

Tags

CCSS.8.G.A.3