Calculating Perimeter of Composite Figures

In this video, Mr. J explains how to find the perimeter of composite figures. He begins by defining perimeter and composite figures, then walks through two examples, highlighting common mistakes and strategies to avoid them. The video emphasizes the importance of organization and careful calculation to ensure accuracy. Mr. J concludes with a summary of the key points and encourages viewers to stay organized when solving similar problems.

What is the perimeter of a figure?

• The volume of the figure

• The number of sides of the figure

• The distance around the figure

• The area inside the figure

What does two-dimensional mean in the context of perimeter?

• Having volume

• Being flat

• Being circular

• Having multiple layers

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What is a common mistake when calculating the perimeter of composite figures?

• Forgetting to add all sides

• Using the wrong units

• Only counting the longest side

• Multiplying side lengths

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CCSS.3.MD.D.8

How many sides did the first example figure have?

• Five

• Four

• Seven

• Six

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What was the perimeter of the first example figure?

• 32 feet

• 30 feet

• 28 feet

• 34 feet

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Which strategy can be used to avoid counting errors in perimeter calculation?

• Using a calculator

• Estimating the total

• Crossing off counted sides

• Calculating area first

How many sides did the second example figure have?

• Nine

• Six

• Eight

• Seven

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What was the perimeter of the second example figure?

• 46 meters

• 48 meters

• 52 meters

• 50 meters

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What is essential to ensure when calculating the perimeter of composite figures?

• Using different units for each side

• Adding side lengths correctly

• Calculating the area instead

• Ignoring smaller sides

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What final advice does Mr. J give about calculating perimeter?

• Always use a calculator

• Stay organized and add all sides

• Guess if unsure

• Focus on the shape's area

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