Perimeter: Understanding and Calculating the Total Distance Around a 2D Shape

The video tutorial explains the concept of perimeter, its real-life applications, and how to calculate it for various shapes, including rectangles, regular pentagons, and compound shapes. It also covers using algebra to find perimeters when side lengths are expressed as variables. The tutorial emphasizes the importance of adding all side lengths and understanding the units of measurement.

What is the perimeter of a shape?

• The area inside a shape

• The total distance around a 2D shape

• The volume of a 3D object

• The diagonal length of a rectangle

How do you calculate the perimeter of a rectangle?

• Divide the length by the width

• Multiply the length by the width

• Add all the side lengths together

• Subtract the width from the length

In a rectangle, if one side is 100 meters, what is the length of the opposite side?

• It depends on the width

• 200 meters

• 100 meters

• 50 meters

How can you quickly calculate the perimeter of a regular pentagon with side length 20 cm?

• Subtract 5 from 20

• Divide 20 by 5

• Multiply 20 by 5

• Add 20 five times

When dealing with algebraic expressions for perimeter, what should you do?

• Ignore the letters and focus on numbers

• Subtract the variables from each other

• Multiply all variables together

• Add the coefficients of the same variables

What is a compound shape?

• A shape with only one side

• A shape with no angles

• A shape that is always circular

• A shape made up of multiple shapes

How do you find the perimeter of a compound shape?

• Multiply the total number of sides by the longest side

• Add all the side lengths, including any missing ones

• Subtract the shortest side from the longest side

• Only add the longest sides