Missing Side (Perimeter)

Front

What is perimeter?

Back

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

Front

How do you find the perimeter of a rectangle?

Back

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

Tags

CCSS.4.MD.A.3

Front

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

Back

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

Tags

CCSS.4.MD.A.3

Front

What is the formula to find the missing side of a shape when the perimeter is known?

Back

Missing side = Perimeter - (sum of the known sides).

Tags

CCSS.3.MD.D.8

Front

If the perimeter of a shape is 40 inches and three sides are 10 inches each, what is the length of the missing side?

Back

Missing side = 40 - (10 + 10 + 10) = 10 inches.

Tags

CCSS.3.MD.D.8

Front

What is the length of the missing side if the perimeter is 62 inches and two sides are 20 inches each?

Back

Missing side = 62 - (20 + 20) = 22 inches.

Tags

CCSS.3.MD.D.8

Front

If the perimeter is 56 inches and two sides are 15 inches each, what is the length of the missing side?

Back

Missing side = 56 - (15 + 15) = 26 inches.

Tags

CCSS.3.MD.D.8

Front

What is the length of the missing side if the perimeter is 18 inches and one side is 10 inches?

Back

Missing side = 18 - 10 = 8 inches.

Tags

CCSS.3.MD.D.8

Front

If the perimeter is 11 inches and one side is 5 inches, what is the length of the missing side?

Back

Missing side = 11 - 5 = 6 inches.

Tags

CCSS.3.MD.D.8

Front

What is a common mistake when calculating the missing side of a shape?

Back

Forgetting to add up all the known sides before subtracting from the perimeter.

Tags

CCSS.3.MD.D.8