Understanding Perimeter in Rectangles

The video tutorial explains how to find missing side lengths of a rectangle when given the perimeter and one side length. It starts with an introduction to the concept of perimeter, followed by a step-by-step solution to find the missing width of a rectangle. The tutorial then presents a second example, demonstrating how to calculate the missing length using a different approach. The video emphasizes understanding the relationship between perimeter and side lengths, using simple arithmetic to solve for unknowns.

What is the perimeter of a shape?

• The area inside the shape

• The length of all sides added together

• The length of the longest side

• The width of the shape

If a rectangle has a length of 10 inches and a perimeter of 24 inches, what is the width?

• 2 inches

• 6 inches

• 4 inches

• 8 inches

How do you calculate the perimeter of a rectangle?

• Length plus width plus height

• 2 times length plus 2 times width

• Length plus width

• Length times width

In the first example, what is the total length of the two known sides?

• 30 inches

• 24 inches

• 20 inches

• 10 inches

If a rectangle has a width of 8 inches and a perimeter of 36 inches, what is the length?

• 10 inches

• 12 inches

• 14 inches

• 16 inches

What formula can be used to find the missing length if the width and perimeter are known?

• Perimeter minus width

• Perimeter plus width

• Perimeter divided by width

• Perimeter minus double the width, then divide by 2

In the second example, what is the total width of the two known sides?

• 8 inches

• 16 inches

• 32 inches

• 24 inches

What is the result of 2 times 8 in the second example?

• 16

• 18

• 14

• 12

How do you find the missing side length when given the perimeter and one side?

• Subtract the known side from the perimeter

• Add the known side to the perimeter

• Divide the perimeter by the known side

• Use the formula: Perimeter minus double the known side, then divide by 2

What is the basic fact used to find the missing length in the second example?

• 2 times 5

• 2 times 10

• 2 times 15

• 2 times 20