Calculating the Missing Side of a Rectangle from Perimeter

The video tutorial covers advanced perimeter problems involving rectangles. It begins with a challenge to find a missing side length using given perimeter and length. The instructor demonstrates three strategies: calculating the missing width, using the doubling strategy, and employing the L-shape strategy. Each method is explained with examples, emphasizing the importance of understanding perimeter concepts and applying them to solve for unknown dimensions. The tutorial encourages re-watching and practicing the strategies to enhance problem-solving skills.

What is the formula to calculate the perimeter of a rectangle?

• 2 * (Length + Width)

• Length * Width

• Length / Width

• Length + Width

Tags

CCSS.4.MD.A.3

If the perimeter of a rectangle is 32cm and one length is 5cm, what is the width?

• 5cm

• 22cm

• 16cm

• 11cm

Tags

CCSS.4.MD.A.3

What strategy is used when dealing with an odd perimeter?

• Doubling

• Halving

• Multiplying

• Subtracting

Tags

CCSS.3.MD.D.8

How do you find one length when given the doubled width and perimeter?

• Add and divide by 2

• Subtract doubled width from perimeter and divide by 2

• Multiply by 2

• Divide perimeter by width

Tags

CCSS.3.MD.D.8

What is the first step in the Doubling strategy?

• Find the perimeter

• Divide the perimeter by 2

• Subtract the length from the perimeter

• Double the width

Tags

CCSS.4.MD.A.2

If the width is 3m and the perimeter is 17m, what is the length?

• 6m

• 11m

• 8.5m

• 5.5m

Tags

CCSS.3.MD.D.8

Why is there a remainder when dividing the perimeter by 2 in the example with an odd perimeter?

• Because the length is odd

• Because the width is odd

• Because the calculation is incorrect

• Because the perimeter is odd

What is the purpose of dividing by 2 in the Doubling strategy?

• To find one length from the doubled total

• To halve the perimeter

• To find the original width

• To find the doubled length

Tags

CCSS.4.MD.A.2

What is the missing width if the length is 9cm and the perimeter is 30cm?

• 12cm

• 6cm

• 15cm

• 9cm

Tags

CCSS.3.MD.D.8

How can checking your work help in solving perimeter problems?

• Ensures the correct use of formulas

• Neither A nor B

• Both A and B

• Confirms the accuracy of calculations