Finding Missing Side Lengths

This video tutorial explains how to find the perimeter of compound shapes. It begins with an introduction to the concept of perimeter, emphasizing the need to add the lengths of all sides. The tutorial provides multiple examples, each demonstrating how to calculate the perimeter by identifying and summing the lengths of all sides, including those that are initially missing. The video concludes with a summary and encourages viewers to engage with the content by attempting the problems themselves.

What is the first step in finding the perimeter of a compound shape?

• Subtract the lengths of all sides

• Add the lengths of all sides

• Divide the lengths of all sides

• Multiply the lengths of all sides

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CCSS.3.MD.C.7B

CCSS.4.MD.A.3

In the first example, what is the missing vertical side length if the total vertical length is 8 cm and one side is 3 cm?

• 2 cm

• 5 cm

• 6 cm

• 3 cm

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CCSS.2.MD.B.5

How do you find the missing horizontal side length if the total horizontal length is 7 cm and one side is 5 cm?

• Divide 7 cm by 5 cm

• Subtract 5 cm from 7 cm

• Add 5 cm to 7 cm

• Multiply 5 cm by 7 cm

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CCSS.2.MD.B.5

In the second example, if the bottom length is 10 meters and one part is 3 meters, what is the length of the other part?

• 7 meters

• 6 meters

• 5 meters

• 4 meters

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CCSS.8.G.B.8

What is the total vertical length if one side is 6 meters and the other is 4 meters?

• 8 meters

• 10 meters

• 12 meters

• 9 meters

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CCSS.4.MD.A.2

In the third example, what is the missing horizontal side length if the total is 10 cm and two parts are 3 cm each?

• 3 cm

• 4 cm

• 5 cm

• 6 cm

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CCSS.2.MD.B.5

How do you find the missing vertical side if the total is 9 cm and one part is 5 cm?

• Subtract 5 cm from 9 cm

• Add 5 cm to 9 cm

• Multiply 5 cm by 9 cm

• Divide 9 cm by 5 cm

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CCSS.8.G.B.8

In the final example, what is the length of the bottom side if it consists of a width of 3 cm and a length of 7 cm?

• 11 cm

• 9 cm

• 8 cm

• 10 cm

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CCSS.3.MD.D.8

What is the total perimeter of the compound shape made of two rectangles if the sides are 7 cm, 3 cm, 4 cm, 7 cm, 3 cm, and 10 cm?

• 32 cm

• 36 cm

• 30 cm

• 34 cm

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CCSS.4.MD.A.2

What is the missing vertical side length if the total is 7 cm and one part is 3 cm?

• 4 cm

• 6 cm

• 5 cm

• 3 cm

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CCSS.4.MD.A.2