Perimeter and Polygon Properties

This video tutorial explains how to calculate the perimeter of polygons, including both regular and irregular shapes. It covers the definition of polygons, the concept of perimeter, and provides step-by-step instructions for calculating the perimeter of various shapes. The video also includes practice questions and a final challenge to reinforce learning. Additionally, it demonstrates how to use a given perimeter to find unknown side lengths. The tutorial concludes with a summary and directs viewers to additional resources for further learning.

What is a polygon?

• A three-dimensional shape with curved sides

• A shape with no sides

• A shape with only one side

• A two-dimensional shape with straight sides

Which of the following is a regular polygon?

• A scalene triangle

• An equilateral triangle

• A rectangle

• A trapezoid

How is the perimeter of a shape defined?

• The area inside the shape

• The distance around the outside of the shape

• The volume of the shape

• The number of sides the shape has

To find the perimeter of a polygon, you should:

• Subtract the length of the longest side from the perimeter

• Divide the total length by the number of sides

• Add together the lengths of all the sides

• Multiply the length of one side by the number of sides

If a polygon has sides measuring 10 cm, 12 cm, 8 cm, 8 cm, and 12 cm, what is its perimeter?

• 50 cm

• 70 cm

• 40 cm

• 60 cm

For a regular pentagon with a side length of 20 cm, what is the perimeter?

• 100 cm

• 90 cm

• 80 cm

• 110 cm

How do you find the length of one side of a square if the perimeter is known?

• Add 4 to the perimeter

• Multiply the perimeter by 4

• Divide the perimeter by 4

• Subtract 4 from the perimeter

A regular octagon has a perimeter of 64 cm. What is the length of one side?

• 6 cm

• 9 cm

• 7 cm

• 8 cm

If the perimeter of an irregular hexagon is 40 cm and the known sides add up to 34 cm, what is the length of the missing side?

• 7 cm

• 5 cm

• 4 cm

• 6 cm

An equilateral triangle has a perimeter of 42 cm. How long is each side?

• 13 cm

• 14 cm

• 12 cm

• 15 cm