Understanding Squares and Triangles

The video tutorial explains how to calculate the perimeter of a square using its side length and diagonal. It starts with the basic formula, which is four times the side length, and provides a simple example. Then, it introduces a more complex scenario where only the diagonal is given. The tutorial uses the 45-45-90 triangle rule to find the side length from the diagonal and then calculates the perimeter. The video concludes with a reminder that the perimeter is a linear measure, applicable in various units.

What is the formula for finding the perimeter of a square?

• 4 times the side length

• 2 times the side length

• Side length squared

• Side length divided by 4

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CCSS.4.MD.A.3

If the side length of a square is 8 units, what is its perimeter?

• 16 units

• 40 units

• 24 units

• 32 units

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CCSS.HSG.CO.C.10

What type of triangle is formed inside a square when using the diagonal?

• 30-60-90 triangle

• 45-45-90 triangle

• Equilateral triangle

• Scalene triangle

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CCSS.8.G.B.8

How do you calculate the side length of a square from its diagonal using the 45-45-90 rule?

• Multiply the diagonal by 2

• Divide the diagonal by 2

• Divide the diagonal by √2

• Multiply the diagonal by √2

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CCSS.8.G.B.8

If the diagonal of a square is 10 units, what is the side length?

• 10√2 units

• 10 units

• 5√2 units

• 5 units

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CCSS.4.MD.A.3

What is the perimeter of a square with a side length of 5√2 units?

• 25√2 units

• 20√2 units

• 10√2 units

• 15√2 units

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CCSS.2.MD.A.3

Which of the following is a linear measure?

• Square units

• Cubic units

• Units

• Square roots

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CCSS.8.G.B.8

What is the significance of the 45-45-90 triangle in finding the side length of a square?

• It provides a ratio to find the side length from the diagonal

• It is used to find the diagonal

• It is used to find the perimeter directly

• It helps in calculating the area

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CCSS.8.G.B.8