Scale Factor of Similar Shapes

If the scale factor is greater than one, the new figure will be

• reduction

• enlargement

• scale

• not proportional

The scale drawing car length is 3 cm. If the scale is 1 cm:4 ft, what is the actual car length?

• 12 feet

• 16 feet 

• 10 feet

• 4 feet

What is the scale factor?

• 4

• 25

What is the measurement of x?

• 21

• 1.25

• 20

• 4

If a Scale Factor is between 0 and 1, then your figure gets...

• Smaller

•  Bigger

• Does not change

If a Scale Factor if greater than 1, then your figure gets...

• Smaller

• Bigger

• Does not change

Joe's picture of a cat was  6 inches by 8 inches.  I copied it.  It is now 3 inches by 4 inches.  My copy is _____________of  the original.  

• ⅙

• ¾

• ¼

• ½

Which triangle is similar to the above triangle ?

• A

• B

• C

• D

Triangle ABC and XYZ are similar.  Use your knowledge of scale factor to find the length of X.

• 20

• 25

• 100

• 40

Two objects that are the same shape but not the same size are _______.

• Congruent

• Vertical

• Similar

• Complementary