Understanding Unknown Side Lengths

The video tutorial explains how to find unknown side lengths of shapes using their perimeters. It begins by defining unknown side lengths and proceeds with three examples. The first example demonstrates finding an unknown side labeled B in a shape with a perimeter of 26 cm. The second example shows how to find an unknown side labeled C in a shape with a perimeter of 28 cm. The third example explains how to determine the side length of a square with a perimeter of 32 cm. The video concludes with a call to action for viewers to like and subscribe.

What is an unknown side length typically labeled with?

• A number

• A color

• A symbol or letter

• A shape

Tags

CCSS.3.MD.D.8

In the first example, what is the perimeter of the shape?

• 26 cm

• 21 cm

• 28 cm

• 32 cm

Tags

CCSS.4.MD.A.2

How do you find the unknown side length B in the first example?

• Divide 26 by 21

• Multiply 21 by 26

• Subtract 21 from 26

• Add 21 to 26

Tags

CCSS.3.MD.D.8

In the second example, what is the perimeter of the shape?

• 21 cm

• 32 cm

• 26 cm

• 28 cm

Tags

CCSS.8.G.B.7

What is the unknown side length C in the second example?

• 6 cm

• 3 cm

• 4 cm

• 5 cm

Tags

CCSS.8.G.B.7

How do you calculate the unknown side length C in the second example?

• Subtract 24 from 28

• Multiply 24 by 28

• Add 24 to 28

• Divide 28 by 24

Tags

CCSS.4.MD.A.3

What is the perimeter of the square in the third example?

• 26 cm

• 28 cm

• 32 cm

• 21 cm

Tags

CCSS.3.MD.D.8

How do you find the side length of the square in the third example?

• Subtract one side from the perimeter

• Multiply one side by 4

• Divide the perimeter by 4

• Add all sides

Tags

CCSS.3.MD.C.7B

CCSS.4.MD.A.3

What is the side length of the square in the third example?

• 8 cm

• 7 cm

• 6 cm

• 9 cm

Tags

CCSS.8.G.B.8

Which method is NOT used to find the side length of the square?

• Addition

• Multiplication

• Subtraction

• Division

Tags

CCSS.8.G.B.8