Missing Side of Perimeter

7. A triangular sign has a perimeter of 30 centimeters. Two of the sides are each 12 centimeters long. What is the length of the third side? (Hint: Perimeter = plus + add slides)

• 6 cm

• 42 cm

• 12 cm

• 16 cm

Blake’s journal has a square cover with the side length shown.

What is the perimeter of Blake’s journal cover in centimeters?

• 104 cm

• 52 cm

• 100 cm

• 74 cm

The perimeter of the figure is 90 units. What is the length of the missing side?

• 10

• 12

• 15

• 20

The lengths of three of the sides of a polygon are shown in the diagram.

The perimeter of the polygon is 29 inches. What is the missing length in inches?

_________________________ inches

Mark’s new rug has a perimeter of 44 feet.  The width of his rug is 12 feet.  

What is the length of his rug? ***Hint: Don't forget to divide your number into 2 sides***

• 5

• 10

• 12

• 15

A triangular sign has a perimeter of 55 inches.  The first side is 21 inches and the second side is 18 inches.  What is the length of the third side?

The lengths of four sides of a polygon are shown.  The perimeter of the polygon is 40 units.  What is the length of the missing side?

• 30

• 8

• 10

• 12

The perimeter of the figure below is 60 centimeters.  What is the length of the missing side?

• 23

• 37

• 21

• 20

The perimeter of the figure below is 60 centimeters.  What is the length of the missing side?

• 23 units

• 37 units

• 21 units

• 20 units

The side lengths of a window are shown in inches.

What is the perimeter of the window in inches? ____________________ in.