Finding Unknown Side Length

An envelope from the post office is 6 inches wide and 8 inches long. What is the perimeter of the envelope?

• 48 inches

• 48 square inches

• 28 square inches

• 28 inches

A rectangular swimming pool was 9 meters wide with an area of 90 square meters. What is the length?

• 180 sq. meters

• 180 meters

• 10 sq. meters

• 10 meters

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 does area mean?

• the distance around a shape
• half the distance around a shape
• the amount of space outside a shape
• the amount of space inside a shape

The area of a rectangle is 49 sq. in.  One side length is 7 in.  What is the other side length?

• 9 in.
• 10 cm.
• 3 in.
• 7 in.

Mrs. Davis wanted to cover the classroom with new carpet. If the length of the classroom was 12 feet and the width was 8 feet. How much carpet would she need to buy?

• 20 feet
• 40 ft
• 96 square feet
• 40 square feet

Kendra is helping her teacher put chalk around the perimeter of the school field. The field is a rectangle with two sides measuring 100 feet and two sides measuring 75 feet. What is the perimeter of the field?

• 1,234 feet

• 350 feet

• 500 feet

• 750 feet

What is the missing measurement? 

• 9 cm
• 18 in
• 18 cm
• 9 in 

What is the perimeter of the rectangle? (Hint: top matches the bottom, left matches the right!)

• 28 sq feet
• 28 feet
• 48 feet
• 48 sq feet

What is the perimeter of this rectangle?

• 21 units
• 12 units
• 3 units
• None of the above.