A Scale and Similarity

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

• reduction

• enlargement

• scale

• not proportional

What is the scale factor?

• 1/2

• 7/3

• 2

• 10/3

Are the following similar? Why or why not?

• Yes, because the corresponding angles are congruent.

• No, the numbers are even

• No, the sides are 2 times larger, but the width is the same.

From Denver to Chicago = 3 in. If the scale is 1 in = 300 miles, find the actual distance.

• 300 miles

• 1000 miles

• 900 miles

• 600 miles

A model of a house was built using the scale 5 in:25 ft. If a window in the model is 1.5 in. wide, how wide is the actual window?

• 90 ft

• 7.5 ft 

• 4.5 ft

• 45 in

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

• Congruent

• Vertical

• Similar

• Complementary 

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

• x = 20

• x = 12

• x = 5

• x = 4

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

• 2

• 3/2

• 2/3

• 1/2

Find missing side

• 5

• 7

• 9

• 11

To find the height of a very tall pine tree, you place a mirror on the ground and stand where you can see the top of the pine tree.  How tall is the tree?

• 144 feet

• 72 feet

• 36 feet