Scale Factor

Scale factor is _________

• the number you multiply the original shape by in order to get the scale copy

• the number you divide the original shape by in order to get the scale copy

• the number you add the original shape by in order to get the scale copy

• the number you subtract the original shape by in order to get the scale copy

Is Figure B a scaled copy of Figure A?

• Yes

• No

What is the scale factor from the original triangle to its copy?

• 1/2

• 5

• 1/4

• 1/5

Tyler says that Figure B is a scaled copy of Figure A because all of the peaks are half as tall. Do you agree with Tyler?

• yes

• no

If you were asked to draw a scaled copy with a scale factor of 1, the copy will be...

• Larger

• Smaller

• The Same Size

Answer explanation

Scale factor of 1 means you multiply all side lengths by 1. Anything multiplied by 1 is itself, so the lengths are not changing. This means the shape is going to be the same size.

If you were asked to draw a scaled copy with a scale factor of 4, the copy will be...

• Larger

• Smaller

• The Same Size

Answer explanation

Scale factor of 4 means you multiply all side lengths by 4. If the lengths are getting longer, the shape is getting larger.

Which of the following is TRUE about corresponding sides?

• They are sides that are in the same position on an original image and on a scaled copy of that image.

• Sides that are anywhere on scale copies, but it doesn't matter if they are in the same spot

• There is only one set of corresponding sides on an image and its scale copy

• You can have corresponding sides on images that are not scale copies

• 0.25
• 0.5
• 2
• 1/2

Which of the following are scaled copies of the original portrait? Select ALL the apply.

• A

• B

• C

• D

• E

What is the scale factor?

• 4

• 6

• 2.5

• 1.5