Perimeter With an Unknown Side

Find the unknown side length if the perimeter is 89 inches.

• 15 in.

• 17 in.

• 20 in.

• 13 in.

This shape has a missing side length labeled with a letter. The perimeter of the shape is labeled inside. Find the unknown side length for each shape.

This shape has a missing side length labeled with a letter. The perimeter of the shape is labeled inside. Find the unknown side length for each shape.

The distance around an object is called the 

• area

• perimeter

What is the missing side length?

• 8 meters

• 7 meters

• 5 meters

• 6 meters

The rectangle has a missing side labeled b cm. The perimeter of the shape is labeled inside. Find the unknown side length for the shape.

• 9 cm

• 6 cm

• 15 cm

• 30 cm

Mrs. Smith puts food on a rectangular table. The perimeter of the table is 18 ft. The width of the table is 3 ft. What is the length of the table?

• 6 ft.

• 3 ft.

• 18 ft.

• 9 ft.

The perimeter of the window is 14 ft. What is the length of the missing side?

• 4 ft

• 3 ft

• 42 ft

• 34 ft

The distance around an object is called the

• area

• perimeter

• length

The perimeter of the painting is 330 cm. What is the length of the missing side?

• 90 cm

• 180 cm

• 255 cm

• 4 cm