Perimeter with an Unknown Side

How would you find the perimeter of this rectangle?

• 2 + 5 + 2 + 5

• (2 x 2) + (2 x 5)

• 2 + 2

• 5 + 5

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 

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

A perimeter of a rectangle is 34 meters.  The width is 4 meters.  What would the length be?

• 17 m

• 13 m

• 15 m

A rectangular pizza has a perimeter of 24 inches. If the length is 8 inches, what is the width?

• 4 inches

• 6 inches

• 8 inches

• 3 inches

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