Scale Factor

Find the perimeter of the large triangle.

• 24

• 36

• 12

• 54

Which side length corresponds with EF?

• ML

• LM

• OL

• EH

Congruent figures always have a scale factor of

_______ .

What is the scale factor?

• 4

• 25

• 5

• 6

• 0.25
• 0.5
• 2
• 1/2

What is a scale factor?

• Shapes that have the same shape, but not necessarily the same size.

• A ratio/number that compares the sizes of the parts of the scale drawings.

• They are sides that are in the same position in different plane figures.  

• The length of a side of a similar figure.

Are these figures similar?

• YES

• NO

If you want to find the scale factor from one figure to another, which formula should you use?

• New/Original

• Original/New

• Part/Whole

What is the scale factor?

• 1

• 2

• 1/2

• -2

Are the following similar? Why or why not?

• Yes

• No, the corresponding angles are not equal.

• No, the ratios of the corresponding sides are not equal.