Ratio Proportion and Similar Figures

Which of these ratios is equivalent to 3:4?

• 12:9

• 9:20

• 9:12

• 803:804

The point (8, 12) was dilated to become point (2, 3). What was the scale factor?

• ½

• ¼

• 4

• 2

Eric is building a scale model of a helicopter at 1/72. If the height of the model is 2 (2/3), what is the actual height of the helicopter?

• 16 feet

• 27 feet

• 48 feet

• 192 feet

A tree is 12 feet tall and casts a shadow 9 feet long. A building nearby casts a shadow that measures 24 feet. How tall is the building? (Draw a picture, set up a proportion)

• 24 feet

• 21 feet

• 27 feet

• 32 feet

Dilate the figure by a scale factor of 3 with the origin as the center of dilation. What are the coordinates of the image?

• A'(9,9) B'(18,18) C'(27,9)

• A'(6,6) B'(9,9) C'(12,6)

• A'(0,0) B'(3,3) C'(6,0)

• A'(1,1) B'(2,2) C'(3,1)

The pair of figures is similar. Find the missing side length.

• x = 10

• x = 4

• x = 2

• x = 5

Find missing side length of the similar triangles

• 5

• 7

• 9

• 11

Sides in similar figures must be proportional.  

• True

• False 

Solve for f.

• 6

• 4

• 3

• 8

What is the scale factor if the triangle on the left is the original?

• 2

• 3/2

• 2/3

• 1/2