Similar shapes

Find x.

(a)  

(a)  

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.

• F
• G
• H
• I

What is the scale factor of these similar shapes (from the left triangle to the right triangle)?

• 10

• 7

• 9

• 11

Triangle ABC and XYZ are similar, ABC is the copy and XYZ is the original shape.  What is the scale factor for triangle XYZ to ABC?

• 2

• ½

• ⅖

• 5/2

What is the area scale factor from B to A?

What is the scale factor of these two shapes from BIG triangle to SMALL triangle?

• 2

• 10

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

• 20
• 25
• 100
• 40

How do you find the scale factor of triangle A to triangle B?

• Add them together

• 14 divided by 7

• 20 Divided by 7

• 20 Multiplied by 7