Finding Side Lengths of Polygons

The video tutorial covers methods to find missing side lengths of polygons when given the perimeter. It starts with a trapezoid example, demonstrating subtraction and addition to find the unknown side. Next, it explains how to calculate the side lengths of a rectangle using its perimeter and known width. Finally, it shows how to find equal side lengths in a triangle by dividing the perimeter by the number of sides, and extends this method to other polygons like squares and pentagons.

What is the first step in finding a missing side length when given the perimeter of a polygon?

• Add all side lengths together

• Subtract known side lengths from the perimeter

• Multiply the perimeter by the number of sides

• Divide the perimeter by the number of sides

If a trapezoid has a perimeter of 19 units and three sides measuring 3, 5, and 3 units, what is the length of the missing side?

• 7 units

• 8 units

• 6 units

• 9 units

In the context of the video, what is the significance of the number 8 when finding the missing side of the trapezoid?

• It is the length of the missing side

• It is the sum of all sides

• It is the total perimeter

• It is the number of sides

In a rectangle, if the perimeter is 20 feet and one width is 4 feet, what is the length of each of the other two sides?

• 7 feet

• 8 feet

• 6 feet

• 5 feet

If a rectangle's perimeter is 20 feet and one side is 4 feet, what is the total length of the other two sides?

• 12 feet

• 14 feet

• 18 feet

• 16 feet

What is the result of subtracting the double width from the perimeter in the rectangle example?

• 8

• 10

• 12

• 14

What is the final step in determining the length of each side of a rectangle when given the perimeter and one side's length?

• Add the remaining length to the perimeter

• Multiply the remaining length by 2

• Subtract the remaining length from the perimeter

• Divide the remaining length by 2

How do you find the length of each side of an equilateral triangle if the perimeter is known?

• Add 3 to the perimeter

• Divide the perimeter by 3

• Subtract the perimeter from 3

• Multiply the perimeter by 3

What is the length of each side of an equilateral triangle with a perimeter of 21 inches?

• 5 inches

• 6 inches

• 7 inches

• 8 inches

What mathematical operation is used to find the length of each side of a polygon with equal sides when the perimeter is known?

• Division

• Subtraction

• Addition

• Multiplication