Perimeter With Unknown

An envelope is 3 inches wide with a perimeter of 30 inches. What is the length of the envelope?

• 90 inches

• 24 inches

• 12 inches

• 10 inches

What is the missing measurement? 

• 9 cm

• 18 in

• 18 cm

• 9 in 

What is the perimeter of this rectangle?

• 21 units

• 12 units

• 3 units

• None of the above.

What is the perimeter of the fence?

• 25

• 30

• 35

• 40

Farmer Bob needs to build a fence for his chickens. The area he wants to build a fence around is 40 feet long and 20 feet wide. How many feet of fence does he need to buy?

• 800 feet

• 120 feet

• 60 feet

A square garden has a perimeter of 100 feet.  What is the length of each side?

• 25 feet

• 50 feet

• 400 feet

• 100 feet

Farmer Bob's son built a track to walk his pet pig.  The track goes around the pig pen.  The pig pen is 15 feet long and 21 feet wide.  If the pig walks all the way around the track, how many feet did he walk?

• 72 feet

• 36 feet

• 36 square feet

This rectangle has a perimeter of 34 cm., find the height

• 11 cm.

• 13 cm.

• 22 cm.

• 5.6 cm.

Do you multiply or add when you find the perimeter?

• Multiply

• Add

What is the unknown side (R) if the perimeter is 30 feet?

• R= 7 ft

• R= 6 ft

• R= 30 ft

• R= 11 ft