8th Unit 2 Lesson 6 Similarity

Which of the following transformations creates similar figures ?

• Translation

• Reflection

• Rotation

• Dilation

Answer explanation

Translations, reflections & rotations are rigid transformations that keep the size and shape the same.

Dilations change the size of the figure.

Tags

CCSS.HSG.SRT.A.2

CCSS.8.G.A.4

How do you find the scale factor of a dilation?

• new x old

• old/new

• new/old

• new - old

Tags

CCSS.8.G.A.3

Match the corresponding sides.

• HE

• AB

• FG

• CD

• EF

• BC

• GH

• DA

Tags

CCSS.HSG.SRT.A.2

What is the scale factor of the dilation that takes ABCD (blue) to EFGH (red)?

• 1/2

• 2

• 1/3

• 3

Answer explanation

Tags

CCSS.8.G.A.3

After the dilation, what transformation happened for ABCD (blue) to turn into DEFG (red)?

• Translation

• Reflection

• Rotation

Tags

CCSS.8.G.A.3

What is the scale factor of the dilation that takes ABC (blue) to CDE (red) ?

• 1/2

• 1/3

• 2

• 3

Answer explanation

New/old = 9/3 = 3

OR 6/2 = 3

Tags

CCSS.HSG.SRT.A.2

CCSS.8.G.A.4

After a dilation w/ center Point A, what transformation would have ABC (blue) match up to CDE (red)?

• Translation

• Reflection

• Rotation

• Another Dilation

Answer explanation

The larger blue triangle is formed after the dilation w/ center A. It would have to SLIDE (translate) into place.

Tags

CCSS.HSG.SRT.A.2

CCSS.8.G.A.4

What scale factor was used to produce the image?

• 2
• -2
• ¹/₂
• 1

Tags

CCSS.8.G.A.3

Match the following transformations to their description:

• Reflection

• 
• Dilation & Rotation

• 
• Rotation

• 
• Dilation & Reflection

• 

Tags

CCSS.8.G.A.3

CCSS.HSG.CO.A.5

Where would A' be if the original shape is dilated by a scale factor of 2 with (0,0) as the center?

Tags

CCSS.8.G.A.3