Scale Factor/ Proportions

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

• an enlargement (get bigger)
• a reduction (get smaller) 

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

• a reduction (get smaller)
• an enlargement (get bigger) 

Sides in similar figures must be proportional.  

• True
• False 

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

• x = 1
• x = 3
• x = 9
• x = 5

Tags

CCSS.HSG.SRT.B.5

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

Tags

CCSS.HSG.SRT.B.5

Solve the proportion.
____ = ____

• p=31.3
• p=308
• p=924
• p=532

Tags

CCSS.7.RP.A.2C

Do the ratios form a proportion?
____ = ____

• Yes, they form a proportion.
• No, they do not form a proportion.

Tags

CCSS.7.RP.A.2A

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

• 2
• 3/2
• 2/3
• 1/2

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

• x = 12
• x = 3
• x = 40
• x = 4

Tags

CCSS.HSG.SRT.A.2

The distance between two cities on a map is 4.125 inches.  Find the actual distance if the scale on the map is 2 inches = 40 miles.

• 165 miles
• 50 miles
• 82.5 miles
• 41.25 miles

Tags

CCSS.6.RP.A.3B