How to Find the Perimeter

This video tutorial explains how to calculate the perimeter of 2D shapes, including composite shapes. It begins with a definition of perimeter and provides examples of calculating perimeter for rectangles, equilateral triangles, and composite shapes. The video emphasizes the importance of including units in answers and offers practice questions for viewers to try. The tutorial is designed to help learners understand and apply the concept of perimeter in various contexts.

What is the perimeter of a shape?

• The number of sides of the shape

• The volume of the shape

• The length of the outline of the shape

• The area inside the shape

How do you find the perimeter of a rectangle if you know the lengths of all sides?

• Multiply the lengths of all sides

• Add the lengths of all sides

• Divide the lengths of all sides

• Subtract the lengths of all sides

If a triangle is equilateral, what can you infer about its sides?

• It has no sides

• All sides are equal

• Two sides are equal, one is different

• All sides are different lengths

When calculating the perimeter of a composite shape, what should you do if some side lengths are missing?

• Use only the known sides

• Label the unknown sides and calculate their lengths

• Ignore the missing sides

• Estimate the missing lengths

Why is it important to include units in your perimeter calculation?

• To confuse the reader

• Units are not necessary

• To ensure the answer is in the correct context

• To make the answer look longer