Perimeter when Missing a Side

Front

What is perimeter?

Back

Perimeter is the total distance around the outside of a shape.

Front

How do you calculate the perimeter of a rectangle?

Back

Add the lengths of all four sides or use the formula: P = 2(length + width).

Front

If a rectangle has a length of 10 cm and a width of 5 cm, what is its perimeter?

Back

P = 2(10 cm + 5 cm) = 30 cm.

Front

What is the formula to find the width if the length and perimeter are known?

Back

Width = (Perimeter/2) - Length.

Front

A rectangle has a perimeter of 20 inches and a length of 6 inches. What is the width?

Back

Width = (20/2) - 6 = 4 inches.

Front

What is the perimeter of a square with each side measuring 4 cm?

Back

P = 4 sides x 4 cm = 16 cm.

Front

If the perimeter of a rectangle is 50 meters and the width is 10 meters, what is the length?

Back

Length = (50/2) - 10 = 15 meters.

Front

What happens to the perimeter if both the length and width of a rectangle are doubled?

Back

The perimeter also doubles.

Front

If a rectangle has a perimeter of 36 cm and one side is 10 cm, what is the other side?

Back

Other side = (36/2) - 10 = 8 cm.

Front

What is the perimeter of a rectangle with a length of 12 m and a width of 3 m?

Back

P = 2(12 m + 3 m) = 30 m.